kafka ReplicaManager 源码
kafka ReplicaManager 代码
文件路径：/core/src/main/scala/kafka/server/ReplicaManager.scala
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kafka.server
import java.io.File
import java.util.Optional
import java.util.concurrent.TimeUnit
import java.util.concurrent.atomic.AtomicBoolean
import java.util.concurrent.locks.Lock
import com.yammer.metrics.core.Meter
import kafka.api._
import kafka.cluster.{BrokerEndPoint, Partition}
import kafka.common.RecordValidationException
import kafka.controller.{KafkaController, StateChangeLogger}
import kafka.log._
import kafka.metrics.KafkaMetricsGroup
import kafka.server.HostedPartition.Online
import kafka.server.QuotaFactory.QuotaManagers
import kafka.server.checkpoints.{LazyOffsetCheckpoints, OffsetCheckpointFile, OffsetCheckpoints}
import kafka.server.metadata.ZkMetadataCache
import kafka.utils._
import kafka.utils.Implicits._
import kafka.zk.KafkaZkClient
import org.apache.kafka.common.{ElectionType, IsolationLevel, Node, TopicIdPartition, TopicPartition, Uuid}
import org.apache.kafka.common.errors._
import org.apache.kafka.common.internals.Topic
import org.apache.kafka.common.message.LeaderAndIsrRequestData.LeaderAndIsrPartitionState
import org.apache.kafka.common.message.DeleteRecordsResponseData.DeleteRecordsPartitionResult
import org.apache.kafka.common.message.{DescribeLogDirsResponseData, DescribeProducersResponseData, FetchResponseData, LeaderAndIsrResponseData}
import org.apache.kafka.common.message.LeaderAndIsrResponseData.LeaderAndIsrTopicError
import org.apache.kafka.common.message.LeaderAndIsrResponseData.LeaderAndIsrPartitionError
import org.apache.kafka.common.message.OffsetForLeaderEpochRequestData.OffsetForLeaderTopic
import org.apache.kafka.common.message.OffsetForLeaderEpochResponseData.{EpochEndOffset, OffsetForLeaderTopicResult}
import org.apache.kafka.common.message.StopReplicaRequestData.StopReplicaPartitionState
import org.apache.kafka.common.metrics.Metrics
import org.apache.kafka.common.network.ListenerName
import org.apache.kafka.common.protocol.Errors
import org.apache.kafka.common.record.FileRecords.TimestampAndOffset
import org.apache.kafka.common.record._
import org.apache.kafka.common.replica.PartitionView.DefaultPartitionView
import org.apache.kafka.common.replica.ReplicaView.DefaultReplicaView
import org.apache.kafka.common.replica.{ClientMetadata, _}
import org.apache.kafka.common.requests.FetchRequest.PartitionData
import org.apache.kafka.common.requests.ProduceResponse.PartitionResponse
import org.apache.kafka.common.requests._
import org.apache.kafka.common.utils.Time
import org.apache.kafka.image.{LocalReplicaChanges, MetadataImage, TopicsDelta}
import org.apache.kafka.metadata.LeaderConstants.NO_LEADER
import org.apache.kafka.server.common.MetadataVersion._
import java.nio.file.{Files, Paths}
import scala.jdk.CollectionConverters._
import scala.collection.{Map, Seq, Set, mutable}
import scala.compat.java8.OptionConverters._
/*
* Result metadata of a log append operation on the log
*/
case class LogAppendResult(info: LogAppendInfo, exception: Option[Throwable] = None) {
def error: Errors = exception match {
case None => Errors.NONE
case Some(e) => Errors.forException(e)
}
}
case class LogDeleteRecordsResult(requestedOffset: Long, lowWatermark: Long, exception: Option[Throwable] = None) {
def error: Errors = exception match {
case None => Errors.NONE
case Some(e) => Errors.forException(e)
}
}
/**
* Result metadata of a log read operation on the log
* @param info @FetchDataInfo returned by the @Log read
* @param divergingEpoch Optional epoch and end offset which indicates the largest epoch such
* that subsequent records are known to diverge on the follower/consumer
* @param highWatermark high watermark of the local replica
* @param leaderLogStartOffset The log start offset of the leader at the time of the read
* @param leaderLogEndOffset The log end offset of the leader at the time of the read
* @param followerLogStartOffset The log start offset of the follower taken from the Fetch request
* @param fetchTimeMs The time the fetch was received
* @param lastStableOffset Current LSO or None if the result has an exception
* @param preferredReadReplica the preferred read replica to be used for future fetches
* @param exception Exception if error encountered while reading from the log
*/
case class LogReadResult(info: FetchDataInfo,
divergingEpoch: Option[FetchResponseData.EpochEndOffset],
highWatermark: Long,
leaderLogStartOffset: Long,
leaderLogEndOffset: Long,
followerLogStartOffset: Long,
fetchTimeMs: Long,
lastStableOffset: Option[Long],
preferredReadReplica: Option[Int] = None,
exception: Option[Throwable] = None) {
def error: Errors = exception match {
case None => Errors.NONE
case Some(e) => Errors.forException(e)
}
def toFetchPartitionData(isReassignmentFetch: Boolean): FetchPartitionData = FetchPartitionData(
this.error,
this.highWatermark,
this.leaderLogStartOffset,
this.info.records,
this.divergingEpoch,
this.lastStableOffset,
this.info.abortedTransactions,
this.preferredReadReplica,
isReassignmentFetch)
def withEmptyFetchInfo: LogReadResult =
copy(info = FetchDataInfo(LogOffsetMetadata.UnknownOffsetMetadata, MemoryRecords.EMPTY))
override def toString = {
"LogReadResult(" +
s"info=$info, " +
s"divergingEpoch=$divergingEpoch, " +
s"highWatermark=$highWatermark, " +
s"leaderLogStartOffset=$leaderLogStartOffset, " +
s"leaderLogEndOffset=$leaderLogEndOffset, " +
s"followerLogStartOffset=$followerLogStartOffset, " +
s"fetchTimeMs=$fetchTimeMs, " +
s"preferredReadReplica=$preferredReadReplica, " +
s"lastStableOffset=$lastStableOffset, " +
s"error=$error" +
")"
}
}
case class FetchPartitionData(error: Errors = Errors.NONE,
highWatermark: Long,
logStartOffset: Long,
records: Records,
divergingEpoch: Option[FetchResponseData.EpochEndOffset],
lastStableOffset: Option[Long],
abortedTransactions: Option[List[FetchResponseData.AbortedTransaction]],
preferredReadReplica: Option[Int],
isReassignmentFetch: Boolean)
/**
* Trait to represent the state of hosted partitions. We create a concrete (active) Partition
* instance when the broker receives a LeaderAndIsr request from the controller or a metadata
* log record from the Quorum controller indicating that the broker should be either a leader
* or follower of a partition.
*/
sealed trait HostedPartition
object HostedPartition {
/**
* This broker does not have any state for this partition locally.
*/
final object None extends HostedPartition
/**
* This broker hosts the partition and it is online.
*/
final case class Online(partition: Partition) extends HostedPartition
/**
* This broker hosts the partition, but it is in an offline log directory.
*/
final object Offline extends HostedPartition
}
object ReplicaManager {
val HighWatermarkFilename = "replication-offset-checkpoint"
}
class ReplicaManager(val config: KafkaConfig,
metrics: Metrics,
time: Time,
scheduler: Scheduler,
val logManager: LogManager,
quotaManagers: QuotaManagers,
val metadataCache: MetadataCache,
logDirFailureChannel: LogDirFailureChannel,
val alterPartitionManager: AlterPartitionManager,
val brokerTopicStats: BrokerTopicStats = new BrokerTopicStats(),
val isShuttingDown: AtomicBoolean = new AtomicBoolean(false),
val zkClient: Option[KafkaZkClient] = None,
delayedProducePurgatoryParam: Option[DelayedOperationPurgatory[DelayedProduce]] = None,
delayedFetchPurgatoryParam: Option[DelayedOperationPurgatory[DelayedFetch]] = None,
delayedDeleteRecordsPurgatoryParam: Option[DelayedOperationPurgatory[DelayedDeleteRecords]] = None,
delayedElectLeaderPurgatoryParam: Option[DelayedOperationPurgatory[DelayedElectLeader]] = None,
threadNamePrefix: Option[String] = None,
) extends Logging with KafkaMetricsGroup {
val delayedProducePurgatory = delayedProducePurgatoryParam.getOrElse(
DelayedOperationPurgatory[DelayedProduce](
purgatoryName = "Produce", brokerId = config.brokerId,
purgeInterval = config.producerPurgatoryPurgeIntervalRequests))
val delayedFetchPurgatory = delayedFetchPurgatoryParam.getOrElse(
DelayedOperationPurgatory[DelayedFetch](
purgatoryName = "Fetch", brokerId = config.brokerId,
purgeInterval = config.fetchPurgatoryPurgeIntervalRequests))
val delayedDeleteRecordsPurgatory = delayedDeleteRecordsPurgatoryParam.getOrElse(
DelayedOperationPurgatory[DelayedDeleteRecords](
purgatoryName = "DeleteRecords", brokerId = config.brokerId,
purgeInterval = config.deleteRecordsPurgatoryPurgeIntervalRequests))
val delayedElectLeaderPurgatory = delayedElectLeaderPurgatoryParam.getOrElse(
DelayedOperationPurgatory[DelayedElectLeader](
purgatoryName = "ElectLeader", brokerId = config.brokerId))
/* epoch of the controller that last changed the leader */
@volatile private[server] var controllerEpoch: Int = KafkaController.InitialControllerEpoch
protected val localBrokerId = config.brokerId
protected val allPartitions = new Pool[TopicPartition, HostedPartition](
valueFactory = Some(tp => HostedPartition.Online(Partition(tp, time, this)))
)
protected val replicaStateChangeLock = new Object
val replicaFetcherManager = createReplicaFetcherManager(metrics, time, threadNamePrefix, quotaManagers.follower)
private[server] val replicaAlterLogDirsManager = createReplicaAlterLogDirsManager(quotaManagers.alterLogDirs, brokerTopicStats)
private val highWatermarkCheckPointThreadStarted = new AtomicBoolean(false)
@volatile private[server] var highWatermarkCheckpoints: Map[String, OffsetCheckpointFile] = logManager.liveLogDirs.map(dir =>
(dir.getAbsolutePath, new OffsetCheckpointFile(new File(dir, ReplicaManager.HighWatermarkFilename), logDirFailureChannel))).toMap
@volatile private var isInControlledShutdown = false
this.logIdent = s"[ReplicaManager broker=$localBrokerId] "
protected val stateChangeLogger = new StateChangeLogger(localBrokerId, inControllerContext = false, None)
private var logDirFailureHandler: LogDirFailureHandler = _
private class LogDirFailureHandler(name: String, haltBrokerOnDirFailure: Boolean) extends ShutdownableThread(name) {
override def doWork(): Unit = {
val newOfflineLogDir = logDirFailureChannel.takeNextOfflineLogDir()
if (haltBrokerOnDirFailure) {
fatal(s"Halting broker because dir $newOfflineLogDir is offline")
Exit.halt(1)
}
handleLogDirFailure(newOfflineLogDir)
}
}
// Visible for testing
private[server] val replicaSelectorOpt: Option[ReplicaSelector] = createReplicaSelector()
newGauge("LeaderCount", () => leaderPartitionsIterator.size)
// Visible for testing
private[kafka] val partitionCount = newGauge("PartitionCount", () => allPartitions.size)
newGauge("OfflineReplicaCount", () => offlinePartitionCount)
newGauge("UnderReplicatedPartitions", () => underReplicatedPartitionCount)
newGauge("UnderMinIsrPartitionCount", () => leaderPartitionsIterator.count(_.isUnderMinIsr))
newGauge("AtMinIsrPartitionCount", () => leaderPartitionsIterator.count(_.isAtMinIsr))
newGauge("ReassigningPartitions", () => reassigningPartitionsCount)
newGauge("PartitionsWithLateTransactionsCount", () => lateTransactionsCount)
def reassigningPartitionsCount: Int = leaderPartitionsIterator.count(_.isReassigning)
private def lateTransactionsCount: Int = {
val currentTimeMs = time.milliseconds()
leaderPartitionsIterator.count(_.hasLateTransaction(currentTimeMs))
}
val isrExpandRate: Meter = newMeter("IsrExpandsPerSec", "expands", TimeUnit.SECONDS)
val isrShrinkRate: Meter = newMeter("IsrShrinksPerSec", "shrinks", TimeUnit.SECONDS)
val failedIsrUpdatesRate: Meter = newMeter("FailedIsrUpdatesPerSec", "failedUpdates", TimeUnit.SECONDS)
def underReplicatedPartitionCount: Int = leaderPartitionsIterator.count(_.isUnderReplicated)
def startHighWatermarkCheckPointThread(): Unit = {
if (highWatermarkCheckPointThreadStarted.compareAndSet(false, true))
scheduler.schedule("highwatermark-checkpoint", checkpointHighWatermarks _, period = config.replicaHighWatermarkCheckpointIntervalMs, unit = TimeUnit.MILLISECONDS)
}
// When ReplicaAlterDirThread finishes replacing a current replica with a future replica, it will
// remove the partition from the partition state map. But it will not close itself even if the
// partition state map is empty. Thus we need to call shutdownIdleReplicaAlterDirThread() periodically
// to shutdown idle ReplicaAlterDirThread
def shutdownIdleReplicaAlterLogDirsThread(): Unit = {
replicaAlterLogDirsManager.shutdownIdleFetcherThreads()
}
def resizeFetcherThreadPool(newSize: Int): Unit = {
replicaFetcherManager.resizeThreadPool(newSize)
}
def getLog(topicPartition: TopicPartition): Option[UnifiedLog] = logManager.getLog(topicPartition)
def hasDelayedElectionOperations: Boolean = delayedElectLeaderPurgatory.numDelayed != 0
def tryCompleteElection(key: DelayedOperationKey): Unit = {
val completed = delayedElectLeaderPurgatory.checkAndComplete(key)
debug("Request key %s unblocked %d ElectLeader.".format(key.keyLabel, completed))
}
def startup(): Unit = {
// start ISR expiration thread
// A follower can lag behind leader for up to config.replicaLagTimeMaxMs x 1.5 before it is removed from ISR
scheduler.schedule("isr-expiration", maybeShrinkIsr _, period = config.replicaLagTimeMaxMs / 2, unit = TimeUnit.MILLISECONDS)
scheduler.schedule("shutdown-idle-replica-alter-log-dirs-thread", shutdownIdleReplicaAlterLogDirsThread _, period = 10000L, unit = TimeUnit.MILLISECONDS)
// If inter-broker protocol (IBP) < 1.0, the controller will send LeaderAndIsrRequest V0 which does not include isNew field.
// In this case, the broker receiving the request cannot determine whether it is safe to create a partition if a log directory has failed.
// Thus, we choose to halt the broker on any log directory failure if IBP < 1.0
val haltBrokerOnFailure = metadataCache.metadataVersion().isLessThan(IBP_1_0_IV0)
logDirFailureHandler = new LogDirFailureHandler("LogDirFailureHandler", haltBrokerOnFailure)
logDirFailureHandler.start()
}
private def maybeRemoveTopicMetrics(topic: String): Unit = {
val topicHasNonOfflinePartition = allPartitions.values.exists {
case online: HostedPartition.Online => topic == online.partition.topic
case HostedPartition.None | HostedPartition.Offline => false
}
if (!topicHasNonOfflinePartition) // nothing online or deferred
brokerTopicStats.removeMetrics(topic)
}
protected def completeDelayedFetchOrProduceRequests(topicPartition: TopicPartition): Unit = {
val topicPartitionOperationKey = TopicPartitionOperationKey(topicPartition)
delayedProducePurgatory.checkAndComplete(topicPartitionOperationKey)
delayedFetchPurgatory.checkAndComplete(topicPartitionOperationKey)
}
def stopReplicas(correlationId: Int,
controllerId: Int,
controllerEpoch: Int,
partitionStates: Map[TopicPartition, StopReplicaPartitionState]
): (mutable.Map[TopicPartition, Errors], Errors) = {
replicaStateChangeLock synchronized {
stateChangeLogger.info(s"Handling StopReplica request correlationId $correlationId from controller " +
s"$controllerId for ${partitionStates.size} partitions")
if (stateChangeLogger.isTraceEnabled)
partitionStates.forKeyValue { (topicPartition, partitionState) =>
stateChangeLogger.trace(s"Received StopReplica request $partitionState " +
s"correlation id $correlationId from controller $controllerId " +
s"epoch $controllerEpoch for partition $topicPartition")
}
val responseMap = new collection.mutable.HashMap[TopicPartition, Errors]
if (controllerEpoch < this.controllerEpoch) {
stateChangeLogger.warn(s"Ignoring StopReplica request from " +
s"controller $controllerId with correlation id $correlationId " +
s"since its controller epoch $controllerEpoch is old. " +
s"Latest known controller epoch is ${this.controllerEpoch}")
(responseMap, Errors.STALE_CONTROLLER_EPOCH)
} else {
this.controllerEpoch = controllerEpoch
val stoppedPartitions = mutable.Map.empty[TopicPartition, Boolean]
partitionStates.forKeyValue { (topicPartition, partitionState) =>
val deletePartition = partitionState.deletePartition()
getPartition(topicPartition) match {
case HostedPartition.Offline =>
stateChangeLogger.warn(s"Ignoring StopReplica request (delete=$deletePartition) from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition as the local replica for the " +
"partition is in an offline log directory")
responseMap.put(topicPartition, Errors.KAFKA_STORAGE_ERROR)
case HostedPartition.Online(partition) =>
val currentLeaderEpoch = partition.getLeaderEpoch
val requestLeaderEpoch = partitionState.leaderEpoch
// When a topic is deleted, the leader epoch is not incremented. To circumvent this,
// a sentinel value (EpochDuringDelete) overwriting any previous epoch is used.
// When an older version of the StopReplica request which does not contain the leader
// epoch, a sentinel value (NoEpoch) is used and bypass the epoch validation.
if (requestLeaderEpoch == LeaderAndIsr.EpochDuringDelete ||
requestLeaderEpoch == LeaderAndIsr.NoEpoch ||
requestLeaderEpoch > currentLeaderEpoch) {
stoppedPartitions += topicPartition -> deletePartition
// Assume that everything will go right. It is overwritten in case of an error.
responseMap.put(topicPartition, Errors.NONE)
} else if (requestLeaderEpoch < currentLeaderEpoch) {
stateChangeLogger.warn(s"Ignoring StopReplica request (delete=$deletePartition) from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition since its associated " +
s"leader epoch $requestLeaderEpoch is smaller than the current " +
s"leader epoch $currentLeaderEpoch")
responseMap.put(topicPartition, Errors.FENCED_LEADER_EPOCH)
} else {
stateChangeLogger.info(s"Ignoring StopReplica request (delete=$deletePartition) from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition since its associated " +
s"leader epoch $requestLeaderEpoch matches the current leader epoch")
responseMap.put(topicPartition, Errors.FENCED_LEADER_EPOCH)
}
case HostedPartition.None =>
// Delete log and corresponding folders in case replica manager doesn't hold them anymore.
// This could happen when topic is being deleted while broker is down and recovers.
stoppedPartitions += topicPartition -> deletePartition
responseMap.put(topicPartition, Errors.NONE)
}
}
stopPartitions(stoppedPartitions).foreach { case (topicPartition, e) =>
if (e.isInstanceOf[KafkaStorageException]) {
stateChangeLogger.error(s"Ignoring StopReplica request (delete=true) from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition as the local replica for the " +
"partition is in an offline log directory")
} else {
stateChangeLogger.error(s"Ignoring StopReplica request (delete=true) from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition due to an unexpected " +
s"${e.getClass.getName} exception: ${e.getMessage}")
}
responseMap.put(topicPartition, Errors.forException(e))
}
(responseMap, Errors.NONE)
}
}
}
/**
* Stop the given partitions.
*
* @param partitionsToStop A map from a topic partition to a boolean indicating
* whether the partition should be deleted.
*
* @return A map from partitions to exceptions which occurred.
* If no errors occurred, the map will be empty.
*/
protected def stopPartitions(
partitionsToStop: Map[TopicPartition, Boolean]
): Map[TopicPartition, Throwable] = {
// First stop fetchers for all partitions.
val partitions = partitionsToStop.keySet
replicaFetcherManager.removeFetcherForPartitions(partitions)
replicaAlterLogDirsManager.removeFetcherForPartitions(partitions)
// Second remove deleted partitions from the partition map. Fetchers rely on the
// ReplicaManager to get Partition's information so they must be stopped first.
val partitionsToDelete = mutable.Set.empty[TopicPartition]
partitionsToStop.forKeyValue { (topicPartition, shouldDelete) =>
if (shouldDelete) {
getPartition(topicPartition) match {
case hostedPartition: HostedPartition.Online =>
if (allPartitions.remove(topicPartition, hostedPartition)) {
maybeRemoveTopicMetrics(topicPartition.topic)
// Logs are not deleted here. They are deleted in a single batch later on.
// This is done to avoid having to checkpoint for every deletions.
hostedPartition.partition.delete()
}
case _ =>
}
partitionsToDelete += topicPartition
}
// If we were the leader, we may have some operations still waiting for completion.
// We force completion to prevent them from timing out.
completeDelayedFetchOrProduceRequests(topicPartition)
}
// Third delete the logs and checkpoint.
val errorMap = new mutable.HashMap[TopicPartition, Throwable]()
if (partitionsToDelete.nonEmpty) {
// Delete the logs and checkpoint.
logManager.asyncDelete(partitionsToDelete, (tp, e) => errorMap.put(tp, e))
}
errorMap
}
def getPartition(topicPartition: TopicPartition): HostedPartition = {
Option(allPartitions.get(topicPartition)).getOrElse(HostedPartition.None)
}
def isAddingReplica(topicPartition: TopicPartition, replicaId: Int): Boolean = {
getPartition(topicPartition) match {
case Online(partition) => partition.isAddingReplica(replicaId)
case _ => false
}
}
// Visible for testing
def createPartition(topicPartition: TopicPartition): Partition = {
val partition = Partition(topicPartition, time, this)
allPartitions.put(topicPartition, HostedPartition.Online(partition))
partition
}
def onlinePartition(topicPartition: TopicPartition): Option[Partition] = {
getPartition(topicPartition) match {
case HostedPartition.Online(partition) => Some(partition)
case _ => None
}
}
// An iterator over all non offline partitions. This is a weakly consistent iterator; a partition made offline after
// the iterator has been constructed could still be returned by this iterator.
private def onlinePartitionsIterator: Iterator[Partition] = {
allPartitions.values.iterator.flatMap {
case HostedPartition.Online(partition) => Some(partition)
case _ => None
}
}
private def offlinePartitionCount: Int = {
allPartitions.values.iterator.count(_ == HostedPartition.Offline)
}
def getPartitionOrException(topicPartition: TopicPartition): Partition = {
getPartitionOrError(topicPartition) match {
case Left(Errors.KAFKA_STORAGE_ERROR) =>
throw new KafkaStorageException(s"Partition $topicPartition is in an offline log directory")
case Left(error) =>
throw error.exception(s"Error while fetching partition state for $topicPartition")
case Right(partition) => partition
}
}
def getPartitionOrError(topicPartition: TopicPartition): Either[Errors, Partition] = {
getPartition(topicPartition) match {
case HostedPartition.Online(partition) =>
Right(partition)
case HostedPartition.Offline =>
Left(Errors.KAFKA_STORAGE_ERROR)
case HostedPartition.None if metadataCache.contains(topicPartition) =>
// The topic exists, but this broker is no longer a replica of it, so we return NOT_LEADER_OR_FOLLOWER which
// forces clients to refresh metadata to find the new location. This can happen, for example,
// during a partition reassignment if a produce request from the client is sent to a broker after
// the local replica has been deleted.
Left(Errors.NOT_LEADER_OR_FOLLOWER)
case HostedPartition.None =>
Left(Errors.UNKNOWN_TOPIC_OR_PARTITION)
}
}
def localLogOrException(topicPartition: TopicPartition): UnifiedLog = {
getPartitionOrException(topicPartition).localLogOrException
}
def futureLocalLogOrException(topicPartition: TopicPartition): UnifiedLog = {
getPartitionOrException(topicPartition).futureLocalLogOrException
}
def futureLogExists(topicPartition: TopicPartition): Boolean = {
getPartitionOrException(topicPartition).futureLog.isDefined
}
def localLog(topicPartition: TopicPartition): Option[UnifiedLog] = {
onlinePartition(topicPartition).flatMap(_.log)
}
def getLogDir(topicPartition: TopicPartition): Option[String] = {
localLog(topicPartition).map(_.parentDir)
}
/**
* TODO: move this action queue to handle thread so we can simplify concurrency handling
*/
private val actionQueue = new ActionQueue
def tryCompleteActions(): Unit = actionQueue.tryCompleteActions()
/**
* Append messages to leader replicas of the partition, and wait for them to be replicated to other replicas;
* the callback function will be triggered either when timeout or the required acks are satisfied;
* if the callback function itself is already synchronized on some object then pass this object to avoid deadlock.
*
* Noted that all pending delayed check operations are stored in a queue. All callers to ReplicaManager.appendRecords()
* are expected to call ActionQueue.tryCompleteActions for all affected partitions, without holding any conflicting
* locks.
*/
def appendRecords(timeout: Long,
requiredAcks: Short,
internalTopicsAllowed: Boolean,
origin: AppendOrigin,
entriesPerPartition: Map[TopicPartition, MemoryRecords],
responseCallback: Map[TopicPartition, PartitionResponse] => Unit,
delayedProduceLock: Option[Lock] = None,
recordConversionStatsCallback: Map[TopicPartition, RecordConversionStats] => Unit = _ => (),
requestLocal: RequestLocal = RequestLocal.NoCaching): Unit = {
if (isValidRequiredAcks(requiredAcks)) {
val sTime = time.milliseconds
val localProduceResults = appendToLocalLog(internalTopicsAllowed = internalTopicsAllowed,
origin, entriesPerPartition, requiredAcks, requestLocal)
debug("Produce to local log in %d ms".format(time.milliseconds - sTime))
val produceStatus = localProduceResults.map { case (topicPartition, result) =>
topicPartition -> ProducePartitionStatus(
result.info.lastOffset + 1, // required offset
new PartitionResponse(
result.error,
result.info.firstOffset.map(_.messageOffset).getOrElse(-1),
result.info.logAppendTime,
result.info.logStartOffset,
result.info.recordErrors.asJava,
result.info.errorMessage
)
) // response status
}
actionQueue.add {
() =>
localProduceResults.foreach {
case (topicPartition, result) =>
val requestKey = TopicPartitionOperationKey(topicPartition)
result.info.leaderHwChange match {
case LeaderHwChange.Increased =>
// some delayed operations may be unblocked after HW changed
delayedProducePurgatory.checkAndComplete(requestKey)
delayedFetchPurgatory.checkAndComplete(requestKey)
delayedDeleteRecordsPurgatory.checkAndComplete(requestKey)
case LeaderHwChange.Same =>
// probably unblock some follower fetch requests since log end offset has been updated
delayedFetchPurgatory.checkAndComplete(requestKey)
case LeaderHwChange.None =>
// nothing
}
}
}
recordConversionStatsCallback(localProduceResults.map { case (k, v) => k -> v.info.recordConversionStats })
if (delayedProduceRequestRequired(requiredAcks, entriesPerPartition, localProduceResults)) {
// create delayed produce operation
val produceMetadata = ProduceMetadata(requiredAcks, produceStatus)
val delayedProduce = new DelayedProduce(timeout, produceMetadata, this, responseCallback, delayedProduceLock)
// create a list of (topic, partition) pairs to use as keys for this delayed produce operation
val producerRequestKeys = entriesPerPartition.keys.map(TopicPartitionOperationKey(_)).toSeq
// try to complete the request immediately, otherwise put it into the purgatory
// this is because while the delayed produce operation is being created, new
// requests may arrive and hence make this operation completable.
delayedProducePurgatory.tryCompleteElseWatch(delayedProduce, producerRequestKeys)
} else {
// we can respond immediately
val produceResponseStatus = produceStatus.map { case (k, status) => k -> status.responseStatus }
responseCallback(produceResponseStatus)
}
} else {
// If required.acks is outside accepted range, something is wrong with the client
// Just return an error and don't handle the request at all
val responseStatus = entriesPerPartition.map { case (topicPartition, _) =>
topicPartition -> new PartitionResponse(
Errors.INVALID_REQUIRED_ACKS,
LogAppendInfo.UnknownLogAppendInfo.firstOffset.map(_.messageOffset).getOrElse(-1),
RecordBatch.NO_TIMESTAMP,
LogAppendInfo.UnknownLogAppendInfo.logStartOffset
)
}
responseCallback(responseStatus)
}
}
/**
* Delete records on leader replicas of the partition, and wait for delete records operation be propagated to other replicas;
* the callback function will be triggered either when timeout or logStartOffset of all live replicas have reached the specified offset
*/
private def deleteRecordsOnLocalLog(offsetPerPartition: Map[TopicPartition, Long]): Map[TopicPartition, LogDeleteRecordsResult] = {
trace("Delete records on local logs to offsets [%s]".format(offsetPerPartition))
offsetPerPartition.map { case (topicPartition, requestedOffset) =>
// reject delete records operation on internal topics
if (Topic.isInternal(topicPartition.topic)) {
(topicPartition, LogDeleteRecordsResult(-1L, -1L, Some(new InvalidTopicException(s"Cannot delete records of internal topic ${topicPartition.topic}"))))
} else {
try {
val partition = getPartitionOrException(topicPartition)
val logDeleteResult = partition.deleteRecordsOnLeader(requestedOffset)
(topicPartition, logDeleteResult)
} catch {
case e@ (_: UnknownTopicOrPartitionException |
_: NotLeaderOrFollowerException |
_: OffsetOutOfRangeException |
_: PolicyViolationException |
_: KafkaStorageException) =>
(topicPartition, LogDeleteRecordsResult(-1L, -1L, Some(e)))
case t: Throwable =>
error("Error processing delete records operation on partition %s".format(topicPartition), t)
(topicPartition, LogDeleteRecordsResult(-1L, -1L, Some(t)))
}
}
}
}
// If there exists a topic partition that meets the following requirement,
// we need to put a delayed DeleteRecordsRequest and wait for the delete records operation to complete
//
// 1. the delete records operation on this partition is successful
// 2. low watermark of this partition is smaller than the specified offset
private def delayedDeleteRecordsRequired(localDeleteRecordsResults: Map[TopicPartition, LogDeleteRecordsResult]): Boolean = {
localDeleteRecordsResults.exists{ case (_, deleteRecordsResult) =>
deleteRecordsResult.exception.isEmpty && deleteRecordsResult.lowWatermark < deleteRecordsResult.requestedOffset
}
}
/**
* For each pair of partition and log directory specified in the map, if the partition has already been created on
* this broker, move its log files to the specified log directory. Otherwise, record the pair in the memory so that
* the partition will be created in the specified log directory when broker receives LeaderAndIsrRequest for the partition later.
*/
def alterReplicaLogDirs(partitionDirs: Map[TopicPartition, String]): Map[TopicPartition, Errors] = {
replicaStateChangeLock synchronized {
partitionDirs.map { case (topicPartition, destinationDir) =>
try {
/* If the topic name is exceptionally long, we can't support altering the log directory.
* See KAFKA-4893 for details.
* TODO: fix this by implementing topic IDs. */
if (UnifiedLog.logFutureDirName(topicPartition).length > 255)
throw new InvalidTopicException("The topic name is too long.")
if (!logManager.isLogDirOnline(destinationDir))
throw new KafkaStorageException(s"Log directory $destinationDir is offline")
getPartition(topicPartition) match {
case HostedPartition.Online(partition) =>
// Stop current replica movement if the destinationDir is different from the existing destination log directory
if (partition.futureReplicaDirChanged(destinationDir)) {
replicaAlterLogDirsManager.removeFetcherForPartitions(Set(topicPartition))
partition.removeFutureLocalReplica()
}
case HostedPartition.Offline =>
throw new KafkaStorageException(s"Partition $topicPartition is offline")
case HostedPartition.None => // Do nothing
}
// If the log for this partition has not been created yet:
// 1) Record the destination log directory in the memory so that the partition will be created in this log directory
// when broker receives LeaderAndIsrRequest for this partition later.
// 2) Respond with NotLeaderOrFollowerException for this partition in the AlterReplicaLogDirsResponse
logManager.maybeUpdatePreferredLogDir(topicPartition, destinationDir)
// throw NotLeaderOrFollowerException if replica does not exist for the given partition
val partition = getPartitionOrException(topicPartition)
val log = partition.localLogOrException
val topicId = log.topicId
// If the destinationLDir is different from the current log directory of the replica:
// - If there is no offline log directory, create the future log in the destinationDir (if it does not exist) and
// start ReplicaAlterDirThread to move data of this partition from the current log to the future log
// - Otherwise, return KafkaStorageException. We do not create the future log while there is offline log directory
// so that we can avoid creating future log for the same partition in multiple log directories.
val highWatermarkCheckpoints = new LazyOffsetCheckpoints(this.highWatermarkCheckpoints)
if (partition.maybeCreateFutureReplica(destinationDir, highWatermarkCheckpoints)) {
val futureLog = futureLocalLogOrException(topicPartition)
logManager.abortAndPauseCleaning(topicPartition)
val initialFetchState = InitialFetchState(topicId, BrokerEndPoint(config.brokerId, "localhost", -1),
partition.getLeaderEpoch, futureLog.highWatermark)
replicaAlterLogDirsManager.addFetcherForPartitions(Map(topicPartition -> initialFetchState))
}
(topicPartition, Errors.NONE)
} catch {
case e@(_: InvalidTopicException |
_: LogDirNotFoundException |
_: ReplicaNotAvailableException |
_: KafkaStorageException) =>
warn(s"Unable to alter log dirs for $topicPartition", e)
(topicPartition, Errors.forException(e))
case e: NotLeaderOrFollowerException =>
// Retaining REPLICA_NOT_AVAILABLE exception for ALTER_REPLICA_LOG_DIRS for compatibility
warn(s"Unable to alter log dirs for $topicPartition", e)
(topicPartition, Errors.REPLICA_NOT_AVAILABLE)
case t: Throwable =>
error("Error while changing replica dir for partition %s".format(topicPartition), t)
(topicPartition, Errors.forException(t))
}
}
}
}
/*
* Get the LogDirInfo for the specified list of partitions.
*
* Each LogDirInfo specifies the following information for a given log directory:
* 1) Error of the log directory, e.g. whether the log is online or offline
* 2) size and lag of current and future logs for each partition in the given log directory. Only logs of the queried partitions
* are included. There may be future logs (which will replace the current logs of the partition in the future) on the broker after KIP-113 is implemented.
*/
def describeLogDirs(partitions: Set[TopicPartition]): List[DescribeLogDirsResponseData.DescribeLogDirsResult] = {
val logsByDir = logManager.allLogs.groupBy(log => log.parentDir)
config.logDirs.toSet.map { logDir: String =>
val file = Paths.get(logDir)
val absolutePath = file.toAbsolutePath.toString
try {
if (!logManager.isLogDirOnline(absolutePath))
throw new KafkaStorageException(s"Log directory $absolutePath is offline")
val fileStore = Files.getFileStore(file)
val totalBytes = adjustForLargeFileSystems(fileStore.getTotalSpace)
val usableBytes = adjustForLargeFileSystems(fileStore.getUsableSpace)
logsByDir.get(absolutePath) match {
case Some(logs) =>
val topicInfos = logs.groupBy(_.topicPartition.topic).map{case (topic, logs) =>
new DescribeLogDirsResponseData.DescribeLogDirsTopic().setName(topic).setPartitions(
logs.filter { log =>
partitions.contains(log.topicPartition)
}.map { log =>
new DescribeLogDirsResponseData.DescribeLogDirsPartition()
.setPartitionSize(log.size)
.setPartitionIndex(log.topicPartition.partition)
.setOffsetLag(getLogEndOffsetLag(log.topicPartition, log.logEndOffset, log.isFuture))
.setIsFutureKey(log.isFuture)
}.toList.asJava)
}.toList.asJava
new DescribeLogDirsResponseData.DescribeLogDirsResult().setLogDir(absolutePath)
.setErrorCode(Errors.NONE.code).setTopics(topicInfos)
.setTotalBytes(totalBytes).setUsableBytes(usableBytes)
case None =>
new DescribeLogDirsResponseData.DescribeLogDirsResult().setLogDir(absolutePath)
.setErrorCode(Errors.NONE.code)
.setTotalBytes(totalBytes).setUsableBytes(usableBytes)
}
} catch {
case e: KafkaStorageException =>
warn("Unable to describe replica dirs for %s".format(absolutePath), e)
new DescribeLogDirsResponseData.DescribeLogDirsResult()
.setLogDir(absolutePath)
.setErrorCode(Errors.KAFKA_STORAGE_ERROR.code)
case t: Throwable =>
error(s"Error while describing replica in dir $absolutePath", t)
new DescribeLogDirsResponseData.DescribeLogDirsResult()
.setLogDir(absolutePath)
.setErrorCode(Errors.forException(t).code)
}
}.toList
}
// See: https://bugs.openjdk.java.net/browse/JDK-8162520
def adjustForLargeFileSystems(space: Long): Long = {
if (space < 0)
return Long.MaxValue
space
}
def getLogEndOffsetLag(topicPartition: TopicPartition, logEndOffset: Long, isFuture: Boolean): Long = {
localLog(topicPartition) match {
case Some(log) =>
if (isFuture)
log.logEndOffset - logEndOffset
else
math.max(log.highWatermark - logEndOffset, 0)
case None =>
// return -1L to indicate that the LEO lag is not available if the replica is not created or is offline
DescribeLogDirsResponse.INVALID_OFFSET_LAG
}
}
def deleteRecords(timeout: Long,
offsetPerPartition: Map[TopicPartition, Long],
responseCallback: Map[TopicPartition, DeleteRecordsPartitionResult] => Unit): Unit = {
val timeBeforeLocalDeleteRecords = time.milliseconds
val localDeleteRecordsResults = deleteRecordsOnLocalLog(offsetPerPartition)
debug("Delete records on local log in %d ms".format(time.milliseconds - timeBeforeLocalDeleteRecords))
val deleteRecordsStatus = localDeleteRecordsResults.map { case (topicPartition, result) =>
topicPartition ->
DeleteRecordsPartitionStatus(
result.requestedOffset, // requested offset
new DeleteRecordsPartitionResult()
.setLowWatermark(result.lowWatermark)
.setErrorCode(result.error.code)
.setPartitionIndex(topicPartition.partition)) // response status
}
if (delayedDeleteRecordsRequired(localDeleteRecordsResults)) {
// create delayed delete records operation
val delayedDeleteRecords = new DelayedDeleteRecords(timeout, deleteRecordsStatus, this, responseCallback)
// create a list of (topic, partition) pairs to use as keys for this delayed delete records operation
val deleteRecordsRequestKeys = offsetPerPartition.keys.map(TopicPartitionOperationKey(_)).toSeq
// try to complete the request immediately, otherwise put it into the purgatory
// this is because while the delayed delete records operation is being created, new
// requests may arrive and hence make this operation completable.
delayedDeleteRecordsPurgatory.tryCompleteElseWatch(delayedDeleteRecords, deleteRecordsRequestKeys)
} else {
// we can respond immediately
val deleteRecordsResponseStatus = deleteRecordsStatus.map { case (k, status) => k -> status.responseStatus }
responseCallback(deleteRecordsResponseStatus)
}
}
// If all the following conditions are true, we need to put a delayed produce request and wait for replication to complete
//
// 1. required acks = -1
// 2. there is data to append
// 3. at least one partition append was successful (fewer errors than partitions)
private def delayedProduceRequestRequired(requiredAcks: Short,
entriesPerPartition: Map[TopicPartition, MemoryRecords],
localProduceResults: Map[TopicPartition, LogAppendResult]): Boolean = {
requiredAcks == -1 &&
entriesPerPartition.nonEmpty &&
localProduceResults.values.count(_.exception.isDefined) < entriesPerPartition.size
}
private def isValidRequiredAcks(requiredAcks: Short): Boolean = {
requiredAcks == -1 || requiredAcks == 1 || requiredAcks == 0
}
/**
* Append the messages to the local replica logs
*/
private def appendToLocalLog(internalTopicsAllowed: Boolean,
origin: AppendOrigin,
entriesPerPartition: Map[TopicPartition, MemoryRecords],
requiredAcks: Short,
requestLocal: RequestLocal): Map[TopicPartition, LogAppendResult] = {
val traceEnabled = isTraceEnabled
def processFailedRecord(topicPartition: TopicPartition, t: Throwable) = {
val logStartOffset = onlinePartition(topicPartition).map(_.logStartOffset).getOrElse(-1L)
brokerTopicStats.topicStats(topicPartition.topic).failedProduceRequestRate.mark()
brokerTopicStats.allTopicsStats.failedProduceRequestRate.mark()
error(s"Error processing append operation on partition $topicPartition", t)
logStartOffset
}
if (traceEnabled)
trace(s"Append [$entriesPerPartition] to local log")
entriesPerPartition.map { case (topicPartition, records) =>
brokerTopicStats.topicStats(topicPartition.topic).totalProduceRequestRate.mark()
brokerTopicStats.allTopicsStats.totalProduceRequestRate.mark()
// reject appending to internal topics if it is not allowed
if (Topic.isInternal(topicPartition.topic) && !internalTopicsAllowed) {
(topicPartition, LogAppendResult(
LogAppendInfo.UnknownLogAppendInfo,
Some(new InvalidTopicException(s"Cannot append to internal topic ${topicPartition.topic}"))))
} else {
try {
val partition = getPartitionOrException(topicPartition)
val info = partition.appendRecordsToLeader(records, origin, requiredAcks, requestLocal)
val numAppendedMessages = info.numMessages
// update stats for successfully appended bytes and messages as bytesInRate and messageInRate
brokerTopicStats.topicStats(topicPartition.topic).bytesInRate.mark(records.sizeInBytes)
brokerTopicStats.allTopicsStats.bytesInRate.mark(records.sizeInBytes)
brokerTopicStats.topicStats(topicPartition.topic).messagesInRate.mark(numAppendedMessages)
brokerTopicStats.allTopicsStats.messagesInRate.mark(numAppendedMessages)
if (traceEnabled)
trace(s"${records.sizeInBytes} written to log $topicPartition beginning at offset " +
s"${info.firstOffset.getOrElse(-1)} and ending at offset ${info.lastOffset}")
(topicPartition, LogAppendResult(info))
} catch {
// NOTE: Failed produce requests metric is not incremented for known exceptions
// it is supposed to indicate un-expected failures of a broker in handling a produce request
case e@ (_: UnknownTopicOrPartitionException |
_: NotLeaderOrFollowerException |
_: RecordTooLargeException |
_: RecordBatchTooLargeException |
_: CorruptRecordException |
_: KafkaStorageException) =>
(topicPartition, LogAppendResult(LogAppendInfo.UnknownLogAppendInfo, Some(e)))
case rve: RecordValidationException =>
val logStartOffset = processFailedRecord(topicPartition, rve.invalidException)
val recordErrors = rve.recordErrors
(topicPartition, LogAppendResult(LogAppendInfo.unknownLogAppendInfoWithAdditionalInfo(
logStartOffset, recordErrors, rve.invalidException.getMessage), Some(rve.invalidException)))
case t: Throwable =>
val logStartOffset = processFailedRecord(topicPartition, t)
(topicPartition, LogAppendResult(LogAppendInfo.unknownLogAppendInfoWithLogStartOffset(logStartOffset), Some(t)))
}
}
}
}
def fetchOffsetForTimestamp(topicPartition: TopicPartition,
timestamp: Long,
isolationLevel: Option[IsolationLevel],
currentLeaderEpoch: Optional[Integer],
fetchOnlyFromLeader: Boolean): Option[TimestampAndOffset] = {
val partition = getPartitionOrException(topicPartition)
partition.fetchOffsetForTimestamp(timestamp, isolationLevel, currentLeaderEpoch, fetchOnlyFromLeader)
}
def legacyFetchOffsetsForTimestamp(topicPartition: TopicPartition,
timestamp: Long,
maxNumOffsets: Int,
isFromConsumer: Boolean,
fetchOnlyFromLeader: Boolean): Seq[Long] = {
val partition = getPartitionOrException(topicPartition)
partition.legacyFetchOffsetsForTimestamp(timestamp, maxNumOffsets, isFromConsumer, fetchOnlyFromLeader)
}
/**
* Fetch messages from a replica, and wait until enough data can be fetched and return;
* the callback function will be triggered either when timeout or required fetch info is satisfied.
* Consumers may fetch from any replica, but followers can only fetch from the leader.
*/
def fetchMessages(
params: FetchParams,
fetchInfos: Seq[(TopicIdPartition, PartitionData)],
quota: ReplicaQuota,
responseCallback: Seq[(TopicIdPartition, FetchPartitionData)] => Unit
): Unit = {
// check if this fetch request can be satisfied right away
val logReadResults = readFromLocalLog(params, fetchInfos, quota, readFromPurgatory = false)
var bytesReadable: Long = 0
var errorReadingData = false
var hasDivergingEpoch = false
var hasPreferredReadReplica = false
val logReadResultMap = new mutable.HashMap[TopicIdPartition, LogReadResult]
logReadResults.foreach { case (topicIdPartition, logReadResult) =>
brokerTopicStats.topicStats(topicIdPartition.topicPartition.topic).totalFetchRequestRate.mark()
brokerTopicStats.allTopicsStats.totalFetchRequestRate.mark()
if (logReadResult.error != Errors.NONE)
errorReadingData = true
if (logReadResult.divergingEpoch.nonEmpty)
hasDivergingEpoch = true
if (logReadResult.preferredReadReplica.nonEmpty)
hasPreferredReadReplica = true
bytesReadable = bytesReadable + logReadResult.info.records.sizeInBytes
logReadResultMap.put(topicIdPartition, logReadResult)
}
// respond immediately if 1) fetch request does not want to wait
// 2) fetch request does not require any data
// 3) has enough data to respond
// 4) some error happens while reading data
// 5) we found a diverging epoch
// 6) has a preferred read replica
if (params.maxWaitMs <= 0 || fetchInfos.isEmpty || bytesReadable >= params.minBytes || errorReadingData ||
hasDivergingEpoch || hasPreferredReadReplica) {
val fetchPartitionData = logReadResults.map { case (tp, result) =>
val isReassignmentFetch = params.isFromFollower && isAddingReplica(tp.topicPartition, params.replicaId)
tp -> result.toFetchPartitionData(isReassignmentFetch)
}
responseCallback(fetchPartitionData)
} else {
// construct the fetch results from the read results
val fetchPartitionStatus = new mutable.ArrayBuffer[(TopicIdPartition, FetchPartitionStatus)]
fetchInfos.foreach { case (topicIdPartition, partitionData) =>
logReadResultMap.get(topicIdPartition).foreach(logReadResult => {
val logOffsetMetadata = logReadResult.info.fetchOffsetMetadata
fetchPartitionStatus += (topicIdPartition -> FetchPartitionStatus(logOffsetMetadata, partitionData))
})
}
val delayedFetch = new DelayedFetch(
params = params,
fetchPartitionStatus = fetchPartitionStatus,
replicaManager = this,
quota = quota,
responseCallback = responseCallback
)
// create a list of (topic, partition) pairs to use as keys for this delayed fetch operation
val delayedFetchKeys = fetchPartitionStatus.map { case (tp, _) => TopicPartitionOperationKey(tp) }
// try to complete the request immediately, otherwise put it into the purgatory;
// this is because while the delayed fetch operation is being created, new requests
// may arrive and hence make this operation completable.
delayedFetchPurgatory.tryCompleteElseWatch(delayedFetch, delayedFetchKeys)
}
}
/**
* Read from multiple topic partitions at the given offset up to maxSize bytes
*/
def readFromLocalLog(
params: FetchParams,
readPartitionInfo: Seq[(TopicIdPartition, PartitionData)],
quota: ReplicaQuota,
readFromPurgatory: Boolean
): Seq[(TopicIdPartition, LogReadResult)] = {
val traceEnabled = isTraceEnabled
def read(tp: TopicIdPartition, fetchInfo: PartitionData, limitBytes: Int, minOneMessage: Boolean): LogReadResult = {
val offset = fetchInfo.fetchOffset
val partitionFetchSize = fetchInfo.maxBytes
val followerLogStartOffset = fetchInfo.logStartOffset
val adjustedMaxBytes = math.min(fetchInfo.maxBytes, limitBytes)
try {
if (traceEnabled)
trace(s"Fetching log segment for partition $tp, offset $offset, partition fetch size $partitionFetchSize, " +
s"remaining response limit $limitBytes" +
(if (minOneMessage) s", ignoring response/partition size limits" else ""))
val partition = getPartitionOrException(tp.topicPartition)
val fetchTimeMs = time.milliseconds
// Check if topic ID from the fetch request/session matches the ID in the log
val topicId = if (tp.topicId == Uuid.ZERO_UUID) None else Some(tp.topicId)
if (!hasConsistentTopicId(topicId, partition.topicId))
throw new InconsistentTopicIdException("Topic ID in the fetch session did not match the topic ID in the log.")
// If we are the leader, determine the preferred read-replica
val preferredReadReplica = params.clientMetadata.flatMap(
metadata => findPreferredReadReplica(partition, metadata, params.replicaId, fetchInfo.fetchOffset, fetchTimeMs))
if (preferredReadReplica.isDefined) {
replicaSelectorOpt.foreach { selector =>
debug(s"Replica selector ${selector.getClass.getSimpleName} returned preferred replica " +
s"${preferredReadReplica.get} for ${params.clientMetadata}")
}
// If a preferred read-replica is set, skip the read
val offsetSnapshot = partition.fetchOffsetSnapshot(fetchInfo.currentLeaderEpoch, fetchOnlyFromLeader = false)
LogReadResult(info = FetchDataInfo(LogOffsetMetadata.UnknownOffsetMetadata, MemoryRecords.EMPTY),
divergingEpoch = None,
highWatermark = offsetSnapshot.highWatermark.messageOffset,
leaderLogStartOffset = offsetSnapshot.logStartOffset,
leaderLogEndOffset = offsetSnapshot.logEndOffset.messageOffset,
followerLogStartOffset = followerLogStartOffset,
fetchTimeMs = -1L,
lastStableOffset = Some(offsetSnapshot.lastStableOffset.messageOffset),
preferredReadReplica = preferredReadReplica,
exception = None)
} else {
// Try the read first, this tells us whether we need all of adjustedFetchSize for this partition
val readInfo: LogReadInfo = partition.fetchRecords(
fetchParams = params,
fetchPartitionData = fetchInfo,
fetchTimeMs = fetchTimeMs,
maxBytes = adjustedMaxBytes,
minOneMessage = minOneMessage,
updateFetchState = !readFromPurgatory
)
val fetchDataInfo = if (params.isFromFollower && shouldLeaderThrottle(quota, partition, params.replicaId)) {
// If the partition is being throttled, simply return an empty set.
FetchDataInfo(readInfo.fetchedData.fetchOffsetMetadata, MemoryRecords.EMPTY)
} else if (!params.hardMaxBytesLimit && readInfo.fetchedData.firstEntryIncomplete) {
// For FetchRequest version 3, we replace incomplete message sets with an empty one as consumers can make
// progress in such cases and don't need to report a `RecordTooLargeException`
FetchDataInfo(readInfo.fetchedData.fetchOffsetMetadata, MemoryRecords.EMPTY)
} else {
readInfo.fetchedData
}
LogReadResult(info = fetchDataInfo,
divergingEpoch = readInfo.divergingEpoch,
highWatermark = readInfo.highWatermark,
leaderLogStartOffset = readInfo.logStartOffset,
leaderLogEndOffset = readInfo.logEndOffset,
followerLogStartOffset = followerLogStartOffset,
fetchTimeMs = fetchTimeMs,
lastStableOffset = Some(readInfo.lastStableOffset),
preferredReadReplica = preferredReadReplica,
exception = None
)
}
} catch {
// NOTE: Failed fetch requests metric is not incremented for known exceptions since it
// is supposed to indicate un-expected failure of a broker in handling a fetch request
case e@ (_: UnknownTopicOrPartitionException |
_: NotLeaderOrFollowerException |
_: UnknownLeaderEpochException |
_: FencedLeaderEpochException |
_: ReplicaNotAvailableException |
_: KafkaStorageException |
_: OffsetOutOfRangeException |
_: InconsistentTopicIdException) =>
LogReadResult(info = FetchDataInfo(LogOffsetMetadata.UnknownOffsetMetadata, MemoryRecords.EMPTY),
divergingEpoch = None,
highWatermark = UnifiedLog.UnknownOffset,
leaderLogStartOffset = UnifiedLog.UnknownOffset,
leaderLogEndOffset = UnifiedLog.UnknownOffset,
followerLogStartOffset = UnifiedLog.UnknownOffset,
fetchTimeMs = -1L,
lastStableOffset = None,
exception = Some(e))
case e: Throwable =>
brokerTopicStats.topicStats(tp.topic).failedFetchRequestRate.mark()
brokerTopicStats.allTopicsStats.failedFetchRequestRate.mark()
val fetchSource = Request.describeReplicaId(params.replicaId)
error(s"Error processing fetch with max size $adjustedMaxBytes from $fetchSource " +
s"on partition $tp: $fetchInfo", e)
LogReadResult(info = FetchDataInfo(LogOffsetMetadata.UnknownOffsetMetadata, MemoryRecords.EMPTY),
divergingEpoch = None,
highWatermark = UnifiedLog.UnknownOffset,
leaderLogStartOffset = UnifiedLog.UnknownOffset,
leaderLogEndOffset = UnifiedLog.UnknownOffset,
followerLogStartOffset = UnifiedLog.UnknownOffset,
fetchTimeMs = -1L,
lastStableOffset = None,
exception = Some(e)
)
}
}
var limitBytes = params.maxBytes
val result = new mutable.ArrayBuffer[(TopicIdPartition, LogReadResult)]
var minOneMessage = !params.hardMaxBytesLimit
readPartitionInfo.foreach { case (tp, fetchInfo) =>
val readResult = read(tp, fetchInfo, limitBytes, minOneMessage)
val recordBatchSize = readResult.info.records.sizeInBytes
// Once we read from a non-empty partition, we stop ignoring request and partition level size limits
if (recordBatchSize > 0)
minOneMessage = false
limitBytes = math.max(0, limitBytes - recordBatchSize)
result += (tp -> readResult)
}
result
}
/**
* Using the configured [[ReplicaSelector]], determine the preferred read replica for a partition given the
* client metadata, the requested offset, and the current set of replicas. If the preferred read replica is the
* leader, return None
*/
def findPreferredReadReplica(partition: Partition,
clientMetadata: ClientMetadata,
replicaId: Int,
fetchOffset: Long,
currentTimeMs: Long): Option[Int] = {
partition.leaderIdIfLocal.flatMap { leaderReplicaId =>
// Don't look up preferred for follower fetches via normal replication
if (Request.isValidBrokerId(replicaId))
None
else {
replicaSelectorOpt.flatMap { replicaSelector =>
val replicaEndpoints = metadataCache.getPartitionReplicaEndpoints(partition.topicPartition,
new ListenerName(clientMetadata.listenerName))
val replicaInfoSet = mutable.Set[ReplicaView]()
partition.remoteReplicas.foreach { replica =>
val replicaState = replica.stateSnapshot
// Exclude replicas that don't have the requested offset (whether or not if they're in the ISR)
if (replicaState.logEndOffset >= fetchOffset && replicaState.logStartOffset <= fetchOffset) {
replicaInfoSet.add(new DefaultReplicaView(
replicaEndpoints.getOrElse(replica.brokerId, Node.noNode()),
replicaState.logEndOffset,
currentTimeMs - replicaState.lastCaughtUpTimeMs
))
}
}
val leaderReplica = new DefaultReplicaView(
replicaEndpoints.getOrElse(leaderReplicaId, Node.noNode()),
partition.localLogOrException.logEndOffset,
0L
)
replicaInfoSet.add(leaderReplica)
val partitionInfo = new DefaultPartitionView(replicaInfoSet.asJava, leaderReplica)
replicaSelector.select(partition.topicPartition, clientMetadata, partitionInfo).asScala.collect {
// Even though the replica selector can return the leader, we don't want to send it out with the
// FetchResponse, so we exclude it here
case selected if !selected.endpoint.isEmpty && selected != leaderReplica => selected.endpoint.id
}
}
}
}
}
/**
* To avoid ISR thrashing, we only throttle a replica on the leader if it's in the throttled replica list,
* the quota is exceeded and the replica is not in sync.
*/
def shouldLeaderThrottle(quota: ReplicaQuota, partition: Partition, replicaId: Int): Boolean = {
val isReplicaInSync = partition.inSyncReplicaIds.contains(replicaId)
!isReplicaInSync && quota.isThrottled(partition.topicPartition) && quota.isQuotaExceeded
}
def getLogConfig(topicPartition: TopicPartition): Option[LogConfig] = localLog(topicPartition).map(_.config)
def getMagic(topicPartition: TopicPartition): Option[Byte] = getLogConfig(topicPartition).map(_.recordVersion.value)
def maybeUpdateMetadataCache(correlationId: Int, updateMetadataRequest: UpdateMetadataRequest) : Seq[TopicPartition] = {
replicaStateChangeLock synchronized {
if (updateMetadataRequest.controllerEpoch < controllerEpoch) {
val stateControllerEpochErrorMessage = s"Received update metadata request with correlation id $correlationId " +
s"from an old controller ${updateMetadataRequest.controllerId} with epoch ${updateMetadataRequest.controllerEpoch}. " +
s"Latest known controller epoch is $controllerEpoch"
stateChangeLogger.warn(stateControllerEpochErrorMessage)
throw new ControllerMovedException(stateChangeLogger.messageWithPrefix(stateControllerEpochErrorMessage))
} else {
val zkMetadataCache = metadataCache.asInstanceOf[ZkMetadataCache]
val deletedPartitions = zkMetadataCache.updateMetadata(correlationId, updateMetadataRequest)
controllerEpoch = updateMetadataRequest.controllerEpoch
deletedPartitions
}
}
}
def becomeLeaderOrFollower(correlationId: Int,
leaderAndIsrRequest: LeaderAndIsrRequest,
onLeadershipChange: (Iterable[Partition], Iterable[Partition]) => Unit): LeaderAndIsrResponse = {
val startMs = time.milliseconds()
replicaStateChangeLock synchronized {
val controllerId = leaderAndIsrRequest.controllerId
val requestPartitionStates = leaderAndIsrRequest.partitionStates.asScala
stateChangeLogger.info(s"Handling LeaderAndIsr request correlationId $correlationId from controller " +
s"$controllerId for ${requestPartitionStates.size} partitions")
if (stateChangeLogger.isTraceEnabled)
requestPartitionStates.foreach { partitionState =>
stateChangeLogger.trace(s"Received LeaderAndIsr request $partitionState " +
s"correlation id $correlationId from controller $controllerId " +
s"epoch ${leaderAndIsrRequest.controllerEpoch}")
}
val topicIds = leaderAndIsrRequest.topicIds()
def topicIdFromRequest(topicName: String): Option[Uuid] = {
val topicId = topicIds.get(topicName)
// if invalid topic ID return None
if (topicId == null || topicId == Uuid.ZERO_UUID)
None
else
Some(topicId)
}
val response = {
if (leaderAndIsrRequest.controllerEpoch < controllerEpoch) {
stateChangeLogger.warn(s"Ignoring LeaderAndIsr request from controller $controllerId with " +
s"correlation id $correlationId since its controller epoch ${leaderAndIsrRequest.controllerEpoch} is old. " +
s"Latest known controller epoch is $controllerEpoch")
leaderAndIsrRequest.getErrorResponse(0, Errors.STALE_CONTROLLER_EPOCH.exception)
} else {
val responseMap = new mutable.HashMap[TopicPartition, Errors]
controllerEpoch = leaderAndIsrRequest.controllerEpoch
val partitions = new mutable.HashSet[Partition]()
val partitionsToBeLeader = new mutable.HashMap[Partition, LeaderAndIsrPartitionState]()
val partitionsToBeFollower = new mutable.HashMap[Partition, LeaderAndIsrPartitionState]()
val topicIdUpdateFollowerPartitions = new mutable.HashSet[Partition]()
// First create the partition if it doesn't exist already
requestPartitionStates.foreach { partitionState =>
val topicPartition = new TopicPartition(partitionState.topicName, partitionState.partitionIndex)
val partitionOpt = getPartition(topicPartition) match {
case HostedPartition.Offline =>
stateChangeLogger.warn(s"Ignoring LeaderAndIsr request from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition as the local replica for the " +
"partition is in an offline log directory")
responseMap.put(topicPartition, Errors.KAFKA_STORAGE_ERROR)
None
case HostedPartition.Online(partition) =>
Some(partition)
case HostedPartition.None =>
val partition = Partition(topicPartition, time, this)
allPartitions.putIfNotExists(topicPartition, HostedPartition.Online(partition))
Some(partition)
}
// Next check the topic ID and the partition's leader epoch
partitionOpt.foreach { partition =>
val currentLeaderEpoch = partition.getLeaderEpoch
val requestLeaderEpoch = partitionState.leaderEpoch
val requestTopicId = topicIdFromRequest(topicPartition.topic)
val logTopicId = partition.topicId
if (!hasConsistentTopicId(requestTopicId, logTopicId)) {
stateChangeLogger.error(s"Topic ID in memory: ${logTopicId.get} does not" +
s" match the topic ID for partition $topicPartition received: " +
s"${requestTopicId.get}.")
responseMap.put(topicPartition, Errors.INCONSISTENT_TOPIC_ID)
} else if (requestLeaderEpoch > currentLeaderEpoch) {
// If the leader epoch is valid record the epoch of the controller that made the leadership decision.
// This is useful while updating the isr to maintain the decision maker controller's epoch in the zookeeper path
if (partitionState.replicas.contains(localBrokerId)) {
partitions += partition
if (partitionState.leader == localBrokerId) {
partitionsToBeLeader.put(partition, partitionState)
} else {
partitionsToBeFollower.put(partition, partitionState)
}
} else {
stateChangeLogger.warn(s"Ignoring LeaderAndIsr request from controller $controllerId with " +
s"correlation id $correlationId epoch $controllerEpoch for partition $topicPartition as itself is not " +
s"in assigned replica list ${partitionState.replicas.asScala.mkString(",")}")
responseMap.put(topicPartition, Errors.UNKNOWN_TOPIC_OR_PARTITION)
}
} else if (requestLeaderEpoch < currentLeaderEpoch) {
stateChangeLogger.warn(s"Ignoring LeaderAndIsr request from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition since its associated " +
s"leader epoch $requestLeaderEpoch is smaller than the current " +
s"leader epoch $currentLeaderEpoch")
responseMap.put(topicPartition, Errors.STALE_CONTROLLER_EPOCH)
} else {
val error = requestTopicId match {
case Some(topicId) if logTopicId.isEmpty =>
// The controller may send LeaderAndIsr to upgrade to using topic IDs without bumping the epoch.
// If we have a matching epoch, we expect the log to be defined.
val log = localLogOrException(partition.topicPartition)
log.assignTopicId(topicId)
stateChangeLogger.info(s"Updating log for $topicPartition to assign topic ID " +
s"$topicId from LeaderAndIsr request from controller $controllerId with correlation " +
s"id $correlationId epoch $controllerEpoch")
if (partitionState.leader != localBrokerId)
topicIdUpdateFollowerPartitions.add(partition)
Errors.NONE
case None if logTopicId.isDefined && partitionState.leader != localBrokerId =>
// If we have a topic ID in the log but not in the request, we must have previously had topic IDs but
// are now downgrading. If we are a follower, remove the topic ID from the PartitionFetchState.
stateChangeLogger.info(s"Updating PartitionFetchState for $topicPartition to remove log topic ID " +
s"${logTopicId.get} since LeaderAndIsr request from controller $controllerId with correlation " +
s"id $correlationId epoch $controllerEpoch did not contain a topic ID")
topicIdUpdateFollowerPartitions.add(partition)
Errors.NONE
case _ =>
stateChangeLogger.info(s"Ignoring LeaderAndIsr request from " +
s"controller $controllerId with correlation id $correlationId " +
s"epoch $controllerEpoch for partition $topicPartition since its associated " +
s"leader epoch $requestLeaderEpoch matches the current leader epoch")
Errors.STALE_CONTROLLER_EPOCH
}
responseMap.put(topicPartition, error)
}
}
}
val highWatermarkCheckpoints = new LazyOffsetCheckpoints(this.highWatermarkCheckpoints)
val partitionsBecomeLeader = if (partitionsToBeLeader.nonEmpty)
makeLeaders(controllerId, controllerEpoch, partitionsToBeLeader, correlationId, responseMap,
highWatermarkCheckpoints, topicIdFromRequest)
else
Set.empty[Partition]
val partitionsBecomeFollower = if (partitionsToBeFollower.nonEmpty)
makeFollowers(controllerId, controllerEpoch, partitionsToBeFollower, correlationId, responseMap,
highWatermarkCheckpoints, topicIdFromRequest)
else
Set.empty[Partition]
val followerTopicSet = partitionsBecomeFollower.map(_.topic).toSet
updateLeaderAndFollowerMetrics(followerTopicSet)
if (topicIdUpdateFollowerPartitions.nonEmpty)
updateTopicIdForFollowers(controllerId, controllerEpoch, topicIdUpdateFollowerPartitions, correlationId, topicIdFromRequest)
// We initialize highwatermark thread after the first LeaderAndIsr request. This ensures that all the partitions
// have been completely populated before starting the checkpointing there by avoiding weird race conditions
startHighWatermarkCheckPointThread()
maybeAddLogDirFetchers(partitions, highWatermarkCheckpoints, topicIdFromRequest)
replicaFetcherManager.shutdownIdleFetcherThreads()
replicaAlterLogDirsManager.shutdownIdleFetcherThreads()
onLeadershipChange(partitionsBecomeLeader, partitionsBecomeFollower)
val data = new LeaderAndIsrResponseData().setErrorCode(Errors.NONE.code)
if (leaderAndIsrRequest.version < 5) {
responseMap.forKeyValue { (tp, error) =>
data.partitionErrors.add(new LeaderAndIsrPartitionError()
.setTopicName(tp.topic)
.setPartitionIndex(tp.partition)
.setErrorCode(error.code))
}
} else {
responseMap.forKeyValue { (tp, error) =>
val topicId = topicIds.get(tp.topic)
var topic = data.topics.find(topicId)
if (topic == null) {
topic = new LeaderAndIsrTopicError().setTopicId(topicId)
data.topics.add(topic)
}
topic.partitionErrors.add(new LeaderAndIsrPartitionError()
.setPartitionIndex(tp.partition)
.setErrorCode(error.code))
}
}
new LeaderAndIsrResponse(data, leaderAndIsrRequest.version)
}
}
val endMs = time.milliseconds()
val elapsedMs = endMs - startMs
stateChangeLogger.info(s"Finished LeaderAndIsr request in ${elapsedMs}ms correlationId $correlationId from controller " +
s"$controllerId for ${requestPartitionStates.size} partitions")
response
}
}
/**
* Checks if the topic ID provided in the request is consistent with the topic ID in the log.
* When using this method to handle a Fetch request, the topic ID may have been provided by an earlier request.
*
* If the request had an invalid topic ID (null or zero), then we assume that topic IDs are not supported.
* The topic ID was not inconsistent, so return true.
* If the log does not exist or the topic ID is not yet set, logTopicIdOpt will be None.
* In both cases, the ID is not inconsistent so return true.
*
* @param requestTopicIdOpt the topic ID from the request if it exists
* @param logTopicIdOpt the topic ID in the log if the log and the topic ID exist
* @return true if the request topic id is consistent, false otherwise
*/
private def hasConsistentTopicId(requestTopicIdOpt: Option[Uuid], logTopicIdOpt: Option[Uuid]): Boolean = {
requestTopicIdOpt match {
case None => true
case Some(requestTopicId) => logTopicIdOpt.isEmpty || logTopicIdOpt.contains(requestTopicId)
}
}
/**
* KAFKA-8392
* For topic partitions of which the broker is no longer a leader, delete metrics related to
* those topics. Note that this means the broker stops being either a replica or a leader of
* partitions of said topics
*/
protected def updateLeaderAndFollowerMetrics(newFollowerTopics: Set[String]): Unit = {
val leaderTopicSet = leaderPartitionsIterator.map(_.topic).toSet
newFollowerTopics.diff(leaderTopicSet).foreach(brokerTopicStats.removeOldLeaderMetrics)
// remove metrics for brokers which are not followers of a topic
leaderTopicSet.diff(newFollowerTopics).foreach(brokerTopicStats.removeOldFollowerMetrics)
}
protected def maybeAddLogDirFetchers(partitions: Set[Partition],
offsetCheckpoints: OffsetCheckpoints,
topicIds: String => Option[Uuid]): Unit = {
val futureReplicasAndInitialOffset = new mutable.HashMap[TopicPartition, InitialFetchState]
for (partition <- partitions) {
val topicPartition = partition.topicPartition
if (logManager.getLog(topicPartition, isFuture = true).isDefined) {
partition.log.foreach { log =>
val leader = BrokerEndPoint(config.brokerId, "localhost", -1)
// Add future replica log to partition's map
partition.createLogIfNotExists(
isNew = false,
isFutureReplica = true,
offsetCheckpoints,
topicIds(partition.topic))
// pause cleaning for partitions that are being moved and start ReplicaAlterDirThread to move
// replica from source dir to destination dir
logManager.abortAndPauseCleaning(topicPartition)
futureReplicasAndInitialOffset.put(topicPartition, InitialFetchState(topicIds(topicPartition.topic), leader,
partition.getLeaderEpoch, log.highWatermark))
}
}
}
if (futureReplicasAndInitialOffset.nonEmpty)
replicaAlterLogDirsManager.addFetcherForPartitions(futureReplicasAndInitialOffset)
}
/*
* Make the current broker to become leader for a given set of partitions by:
*
* 1. Stop fetchers for these partitions
* 2. Update the partition metadata in cache
* 3. Add these partitions to the leader partitions set
*
* If an unexpected error is thrown in this function, it will be propagated to KafkaApis where
* the error message will be set on each partition since we do not know which partition caused it. Otherwise,
* return the set of partitions that are made leader due to this method
*
* TODO: the above may need to be fixed later
*/
private def makeLeaders(controllerId: Int,
controllerEpoch: Int,
partitionStates: Map[Partition, LeaderAndIsrPartitionState],
correlationId: Int,
responseMap: mutable.Map[TopicPartition, Errors],
highWatermarkCheckpoints: OffsetCheckpoints,
topicIds: String => Option[Uuid]): Set[Partition] = {
val traceEnabled = stateChangeLogger.isTraceEnabled
partitionStates.keys.foreach { partition =>
if (traceEnabled)
stateChangeLogger.trace(s"Handling LeaderAndIsr request correlationId $correlationId from " +
s"controller $controllerId epoch $controllerEpoch starting the become-leader transition for " +
s"partition ${partition.topicPartition}")
responseMap.put(partition.topicPartition, Errors.NONE)
}
val partitionsToMakeLeaders = mutable.Set[Partition]()
try {
// First stop fetchers for all the partitions
replicaFetcherManager.removeFetcherForPartitions(partitionStates.keySet.map(_.topicPartition))
stateChangeLogger.info(s"Stopped fetchers as part of LeaderAndIsr request correlationId $correlationId from " +
s"controller $controllerId epoch $controllerEpoch as part of the become-leader transition for " +
s"${partitionStates.size} partitions")
// Update the partition information to be the leader
partitionStates.forKeyValue { (partition, partitionState) =>
try {
if (partition.makeLeader(partitionState, highWatermarkCheckpoints, topicIds(partitionState.topicName))) {
partitionsToMakeLeaders += partition
}
} catch {
case e: KafkaStorageException =>
stateChangeLogger.error(s"Skipped the become-leader state change with " +
s"correlation id $correlationId from controller $controllerId epoch $controllerEpoch for partition ${partition.topicPartition} " +
s"(last update controller epoch ${partitionState.controllerEpoch}) since " +
s"the replica for the partition is offline due to storage error $e")
// If there is an offline log directory, a Partition object may have been created and have been added
// to `ReplicaManager.allPartitions` before `createLogIfNotExists()` failed to create local replica due
// to KafkaStorageException. In this case `ReplicaManager.allPartitions` will map this topic-partition
// to an empty Partition object. We need to map this topic-partition to OfflinePartition instead.
markPartitionOffline(partition.topicPartition)
responseMap.put(partition.topicPartition, Errors.KAFKA_STORAGE_ERROR)
}
}
} catch {
case e: Throwable =>
partitionStates.keys.foreach { partition =>
stateChangeLogger.error(s"Error while processing LeaderAndIsr request correlationId $correlationId received " +
s"from controller $controllerId epoch $controllerEpoch for partition ${partition.topicPartition}", e)
}
// Re-throw the exception for it to be caught in KafkaApis
throw e
}
if (traceEnabled)
partitionStates.keys.foreach { partition =>
stateChangeLogger.trace(s"Completed LeaderAndIsr request correlationId $correlationId from controller $controllerId " +
s"epoch $controllerEpoch for the become-leader transition for partition ${partition.topicPartition}")
}
partitionsToMakeLeaders
}
/*
* Make the current broker to become follower for a given set of partitions by:
*
* 1. Remove these partitions from the leader partitions set.
* 2. Mark the replicas as followers so that no more data can be added from the producer clients.
* 3. Stop fetchers for these partitions so that no more data can be added by the replica fetcher threads.
* 4. Truncate the log and checkpoint offsets for these partitions.
* 5. Clear the produce and fetch requests in the purgatory
* 6. If the broker is not shutting down, add the fetcher to the new leaders.
*
* The ordering of doing these steps make sure that the replicas in transition will not
* take any more messages before checkpointing offsets so that all messages before the checkpoint
* are guaranteed to be flushed to disks
*
* If an unexpected error is thrown in this function, it will be propagated to KafkaApis where
* the error message will be set on each partition since we do not know which partition caused it. Otherwise,
* return the set of partitions that are made follower due to this method
*/
private def makeFollowers(controllerId: Int,
controllerEpoch: Int,
partitionStates: Map[Partition, LeaderAndIsrPartitionState],
correlationId: Int,
responseMap: mutable.Map[TopicPartition, Errors],
highWatermarkCheckpoints: OffsetCheckpoints,
topicIds: String => Option[Uuid]) : Set[Partition] = {
val traceLoggingEnabled = stateChangeLogger.isTraceEnabled
partitionStates.forKeyValue { (partition, partitionState) =>
if (traceLoggingEnabled)
stateChangeLogger.trace(s"Handling LeaderAndIsr request correlationId $correlationId from controller $controllerId " +
s"epoch $controllerEpoch starting the become-follower transition for partition ${partition.topicPartition} with leader " +
s"${partitionState.leader}")
responseMap.put(partition.topicPartition, Errors.NONE)
}
val partitionsToMakeFollower: mutable.Set[Partition] = mutable.Set()
try {
partitionStates.forKeyValue { (partition, partitionState) =>
val newLeaderBrokerId = partitionState.leader
try {
if (metadataCache.hasAliveBroker(newLeaderBrokerId)) {
// Only change partition state when the leader is available
if (partition.makeFollower(partitionState, highWatermarkCheckpoints, topicIds(partitionState.topicName))) {
partitionsToMakeFollower += partition
}
} else {
// The leader broker should always be present in the metadata cache.
// If not, we should record the error message and abort the transition process for this partition
stateChangeLogger.error(s"Received LeaderAndIsrRequest with correlation id $correlationId from " +
s"controller $controllerId epoch $controllerEpoch for partition ${partition.topicPartition} " +
s"(last update controller epoch ${partitionState.controllerEpoch}) " +
s"but cannot become follower since the new leader $newLeaderBrokerId is unavailable.")
// Create the local replica even if the leader is unavailable. This is required to ensure that we include
// the partition's high watermark in the checkpoint file (see KAFKA-1647)
partition.createLogIfNotExists(isNew = partitionState.isNew, isFutureReplica = false,
highWatermarkCheckpoints, topicIds(partitionState.topicName))
}
} catch {
case e: KafkaStorageException =>
stateChangeLogger.error(s"Skipped the become-follower state change with correlation id $correlationId from " +
s"controller $controllerId epoch $controllerEpoch for partition ${partition.topicPartition} " +
s"(last update controller epoch ${partitionState.controllerEpoch}) with leader " +
s"$newLeaderBrokerId since the replica for the partition is offline due to storage error $e")
// If there is an offline log directory, a Partition object may have been created and have been added
// to `ReplicaManager.allPartitions` before `createLogIfNotExists()` failed to create local replica due
// to KafkaStorageException. In this case `ReplicaManager.allPartitions` will map this topic-partition
// to an empty Partition object. We need to map this topic-partition to OfflinePartition instead.
markPartitionOffline(partition.topicPartition)
responseMap.put(partition.topicPartition, Errors.KAFKA_STORAGE_ERROR)
}
}
// Stopping the fetchers must be done first in order to initialize the fetch
// position correctly.
replicaFetcherManager.removeFetcherForPartitions(partitionsToMakeFollower.map(_.topicPartition))
stateChangeLogger.info(s"Stopped fetchers as part of become-follower request from controller $controllerId " +
s"epoch $controllerEpoch with correlation id $correlationId for ${partitionsToMakeFollower.size} partitions")
partitionsToMakeFollower.foreach { partition =>
completeDelayedFetchOrProduceRequests(partition.topicPartition)
}
if (isShuttingDown.get()) {
if (traceLoggingEnabled) {
partitionsToMakeFollower.foreach { partition =>
stateChangeLogger.trace(s"Skipped the adding-fetcher step of the become-follower state " +
s"change with correlation id $correlationId from controller $controllerId epoch $controllerEpoch for " +
s"partition ${partition.topicPartition} with leader ${partitionStates(partition).leader} " +
"since it is shutting down")
}
}
} else {
// we do not need to check if the leader exists again since this has been done at the beginning of this process
val partitionsToMakeFollowerWithLeaderAndOffset = partitionsToMakeFollower.map { partition =>
val leaderNode = partition.leaderReplicaIdOpt.flatMap(leaderId => metadataCache.
getAliveBrokerNode(leaderId, config.interBrokerListenerName)).getOrElse(Node.noNode())
val leader = new BrokerEndPoint(leaderNode.id(), leaderNode.host(), leaderNode.port())
val log = partition.localLogOrException
val fetchOffset = initialFetchOffset(log)
partition.topicPartition -> InitialFetchState(topicIds(partition.topic), leader, partition.getLeaderEpoch, fetchOffset)
}.toMap
replicaFetcherManager.addFetcherForPartitions(partitionsToMakeFollowerWithLeaderAndOffset)
}
} catch {
case e: Throwable =>
stateChangeLogger.error(s"Error while processing LeaderAndIsr request with correlationId $correlationId " +
s"received from controller $controllerId epoch $controllerEpoch", e)
// Re-throw the exception for it to be caught in KafkaApis
throw e
}
if (traceLoggingEnabled)
partitionStates.keys.foreach { partition =>
stateChangeLogger.trace(s"Completed LeaderAndIsr request correlationId $correlationId from controller $controllerId " +
s"epoch $controllerEpoch for the become-follower transition for partition ${partition.topicPartition} with leader " +
s"${partitionStates(partition).leader}")
}
partitionsToMakeFollower
}
private def updateTopicIdForFollowers(controllerId: Int,
controllerEpoch: Int,
partitions: Set[Partition],
correlationId: Int,
topicIds: String => Option[Uuid]): Unit = {
val traceLoggingEnabled = stateChangeLogger.isTraceEnabled
try {
if (isShuttingDown.get()) {
if (traceLoggingEnabled) {
partitions.foreach { partition =>
stateChangeLogger.trace(s"Skipped the update topic ID step of the become-follower state " +
s"change with correlation id $correlationId from controller $controllerId epoch $controllerEpoch for " +
s"partition ${partition.topicPartition} since it is shutting down")
}
}
} else {
val partitionsToUpdateFollowerWithLeader = mutable.Map.empty[TopicPartition, Int]
partitions.foreach { partition =>
partition.leaderReplicaIdOpt.foreach { leader =>
if (metadataCache.hasAliveBroker(leader)) {
partitionsToUpdateFollowerWithLeader += partition.topicPartition -> leader
}
}
}
replicaFetcherManager.maybeUpdateTopicIds(partitionsToUpdateFollowerWithLeader, topicIds)
}
} catch {
case e: Throwable =>
stateChangeLogger.error(s"Error while processing LeaderAndIsr request with correlationId $correlationId " +
s"received from controller $controllerId epoch $controllerEpoch when trying to update topic IDs in the fetchers", e)
// Re-throw the exception for it to be caught in KafkaApis
throw e
}
}
/**
* From IBP 2.7 onwards, we send latest fetch epoch in the request and truncate if a
* diverging epoch is returned in the response, avoiding the need for a separate
* OffsetForLeaderEpoch request.
*/
protected def initialFetchOffset(log: UnifiedLog): Long = {
if (metadataCache.metadataVersion().isTruncationOnFetchSupported && log.latestEpoch.nonEmpty)
log.logEndOffset
else
log.highWatermark
}
private def maybeShrinkIsr(): Unit = {
trace("Evaluating ISR list of partitions to see which replicas can be removed from the ISR")
// Shrink ISRs for non offline partitions
allPartitions.keys.foreach { topicPartition =>
onlinePartition(topicPartition).foreach(_.maybeShrinkIsr())
}
}
private def leaderPartitionsIterator: Iterator[Partition] =
onlinePartitionsIterator.filter(_.leaderLogIfLocal.isDefined)
def getLogEndOffset(topicPartition: TopicPartition): Option[Long] =
onlinePartition(topicPartition).flatMap(_.leaderLogIfLocal.map(_.logEndOffset))
// Flushes the highwatermark value for all partitions to the highwatermark file
def checkpointHighWatermarks(): Unit = {
def putHw(logDirToCheckpoints: mutable.AnyRefMap[String, mutable.AnyRefMap[TopicPartition, Long]],
log: UnifiedLog): Unit = {
val checkpoints = logDirToCheckpoints.getOrElseUpdate(log.parentDir,
new mutable.AnyRefMap[TopicPartition, Long]())
checkpoints.put(log.topicPartition, log.highWatermark)
}
val logDirToHws = new mutable.AnyRefMap[String, mutable.AnyRefMap[TopicPartition, Long]](
allPartitions.size)
onlinePartitionsIterator.foreach { partition =>
partition.log.foreach(putHw(logDirToHws, _))
partition.futureLog.foreach(putHw(logDirToHws, _))
}
for ((logDir, hws) <- logDirToHws) {
try highWatermarkCheckpoints.get(logDir).foreach(_.write(hws))
catch {
case e: KafkaStorageException =>
error(s"Error while writing to highwatermark file in directory $logDir", e)
}
}
}
def markPartitionOffline(tp: TopicPartition): Unit = replicaStateChangeLock synchronized {
allPartitions.put(tp, HostedPartition.Offline)
Partition.removeMetrics(tp)
}
/**
* The log directory failure handler for the replica
*
* @param dir the absolute path of the log directory
* @param sendZkNotification check if we need to send notification to zookeeper node (needed for unit test)
*/
def handleLogDirFailure(dir: String, sendZkNotification: Boolean = true): Unit = {
if (!logManager.isLogDirOnline(dir))
return
warn(s"Stopping serving replicas in dir $dir")
replicaStateChangeLock synchronized {
val newOfflinePartitions = onlinePartitionsIterator.filter { partition =>
partition.log.exists { _.parentDir == dir }
}.map(_.topicPartition).toSet
val partitionsWithOfflineFutureReplica = onlinePartitionsIterator.filter { partition =>
partition.futureLog.exists { _.parentDir == dir }
}.toSet
replicaFetcherManager.removeFetcherForPartitions(newOfflinePartitions)
replicaAlterLogDirsManager.removeFetcherForPartitions(newOfflinePartitions ++ partitionsWithOfflineFutureReplica.map(_.topicPartition))
partitionsWithOfflineFutureReplica.foreach(partition => partition.removeFutureLocalReplica(deleteFromLogDir = false))
newOfflinePartitions.foreach { topicPartition =>
markPartitionOffline(topicPartition)
}
newOfflinePartitions.map(_.topic).foreach { topic: String =>
maybeRemoveTopicMetrics(topic)
}
highWatermarkCheckpoints = highWatermarkCheckpoints.filter { case (checkpointDir, _) => checkpointDir != dir }
warn(s"Broker $localBrokerId stopped fetcher for partitions ${newOfflinePartitions.mkString(",")} and stopped moving logs " +
s"for partitions ${partitionsWithOfflineFutureReplica.mkString(",")} because they are in the failed log directory $dir.")
}
logManager.handleLogDirFailure(dir)
if (sendZkNotification)
if (zkClient.isEmpty) {
warn("Unable to propagate log dir failure via Zookeeper in KRaft mode")
} else {
zkClient.get.propagateLogDirEvent(localBrokerId)
}
warn(s"Stopped serving replicas in dir $dir")
}
def removeMetrics(): Unit = {
removeMetric("LeaderCount")
removeMetric("PartitionCount")
removeMetric("OfflineReplicaCount")
removeMetric("UnderReplicatedPartitions")
removeMetric("UnderMinIsrPartitionCount")
removeMetric("AtMinIsrPartitionCount")
removeMetric("ReassigningPartitions")
removeMetric("PartitionsWithLateTransactionsCount")
}
def beginControlledShutdown(): Unit = {
isInControlledShutdown = true
}
// High watermark do not need to be checkpointed only when under unit tests
def shutdown(checkpointHW: Boolean = true): Unit = {
info("Shutting down")
removeMetrics()
if (logDirFailureHandler != null)
logDirFailureHandler.shutdown()
replicaFetcherManager.shutdown()
replicaAlterLogDirsManager.shutdown()
delayedFetchPurgatory.shutdown()
delayedProducePurgatory.shutdown()
delayedDeleteRecordsPurgatory.shutdown()
delayedElectLeaderPurgatory.shutdown()
if (checkpointHW)
checkpointHighWatermarks()
replicaSelectorOpt.foreach(_.close)
info("Shut down completely")
}
protected def createReplicaFetcherManager(metrics: Metrics, time: Time, threadNamePrefix: Option[String], quotaManager: ReplicationQuotaManager) = {
new ReplicaFetcherManager(config, this, metrics, time, threadNamePrefix, quotaManager, () => metadataCache.metadataVersion())
}
protected def createReplicaAlterLogDirsManager(quotaManager: ReplicationQuotaManager, brokerTopicStats: BrokerTopicStats) = {
new ReplicaAlterLogDirsManager(config, this, quotaManager, brokerTopicStats)
}
protected def createReplicaSelector(): Option[ReplicaSelector] = {
config.replicaSelectorClassName.map { className =>
val tmpReplicaSelector: ReplicaSelector = CoreUtils.createObject[ReplicaSelector](className)
tmpReplicaSelector.configure(config.originals())
tmpReplicaSelector
}
}
def lastOffsetForLeaderEpoch(
requestedEpochInfo: Seq[OffsetForLeaderTopic]
): Seq[OffsetForLeaderTopicResult] = {
requestedEpochInfo.map { offsetForLeaderTopic =>
val partitions = offsetForLeaderTopic.partitions.asScala.map { offsetForLeaderPartition =>
val tp = new TopicPartition(offsetForLeaderTopic.topic, offsetForLeaderPartition.partition)
getPartition(tp) match {
case HostedPartition.Online(partition) =>
val currentLeaderEpochOpt =
if (offsetForLeaderPartition.currentLeaderEpoch == RecordBatch.NO_PARTITION_LEADER_EPOCH)
Optional.empty[Integer]
else
Optional.of[Integer](offsetForLeaderPartition.currentLeaderEpoch)
partition.lastOffsetForLeaderEpoch(
currentLeaderEpochOpt,
offsetForLeaderPartition.leaderEpoch,
fetchOnlyFromLeader = true)
case HostedPartition.Offline =>
new EpochEndOffset()
.setPartition(offsetForLeaderPartition.partition)
.setErrorCode(Errors.KAFKA_STORAGE_ERROR.code)
case HostedPartition.None if metadataCache.contains(tp) =>
new EpochEndOffset()
.setPartition(offsetForLeaderPartition.partition)
.setErrorCode(Errors.NOT_LEADER_OR_FOLLOWER.code)
case HostedPartition.None =>
new EpochEndOffset()
.setPartition(offsetForLeaderPartition.partition)
.setErrorCode(Errors.UNKNOWN_TOPIC_OR_PARTITION.code)
}
}
new OffsetForLeaderTopicResult()
.setTopic(offsetForLeaderTopic.topic)
.setPartitions(partitions.toList.asJava)
}
}
def electLeaders(
controller: KafkaController,
partitions: Set[TopicPartition],
electionType: ElectionType,
responseCallback: Map[TopicPartition, ApiError] => Unit,
requestTimeout: Int
): Unit = {
val deadline = time.milliseconds() + requestTimeout
def electionCallback(results: Map[TopicPartition, Either[ApiError, Int]]): Unit = {
val expectedLeaders = mutable.Map.empty[TopicPartition, Int]
val failures = mutable.Map.empty[TopicPartition, ApiError]
results.foreach {
case (partition, Right(leader)) => expectedLeaders += partition -> leader
case (partition, Left(error)) => failures += partition -> error
}
if (expectedLeaders.nonEmpty) {
val watchKeys = expectedLeaders.iterator.map {
case (tp, _) => TopicPartitionOperationKey(tp)
}.toBuffer
delayedElectLeaderPurgatory.tryCompleteElseWatch(
new DelayedElectLeader(
math.max(0, deadline - time.milliseconds()),
expectedLeaders,
failures,
this,
responseCallback
),
watchKeys
)
} else {
// There are no partitions actually being elected, so return immediately
responseCallback(failures)
}
}
controller.electLeaders(partitions, electionType, electionCallback)
}
def activeProducerState(requestPartition: TopicPartition): DescribeProducersResponseData.PartitionResponse = {
getPartitionOrError(requestPartition) match {
case Left(error) => new DescribeProducersResponseData.PartitionResponse()
.setPartitionIndex(requestPartition.partition)
.setErrorCode(error.code)
case Right(partition) => partition.activeProducerState
}
}
private[kafka] def getOrCreatePartition(tp: TopicPartition,
delta: TopicsDelta,
topicId: Uuid): Option[(Partition, Boolean)] = {
getPartition(tp) match {
case HostedPartition.Offline =>
stateChangeLogger.warn(s"Unable to bring up new local leader $tp " +
s"with topic id $topicId because it resides in an offline log " +
"directory.")
None
case HostedPartition.Online(partition) =>
if (partition.topicId.exists(_ != topicId)) {
// Note: Partition#topicId will be None here if the Log object for this partition
// has not been created.
throw new IllegalStateException(s"Topic $tp exists, but its ID is " +
s"${partition.topicId.get}, not $topicId as expected")
}
Some(partition, false)
case HostedPartition.None =>
if (delta.image().topicsById().containsKey(topicId)) {
stateChangeLogger.error(s"Expected partition $tp with topic id " +
s"$topicId to exist, but it was missing. Creating...")
} else {
stateChangeLogger.info(s"Creating new partition $tp with topic id " +
s"$topicId.")
}
// it's a partition that we don't know about yet, so create it and mark it online
val partition = Partition(tp, time, this)
allPartitions.put(tp, HostedPartition.Online(partition))
Some(partition, true)
}
}
/**
* Apply a KRaft topic change delta.
*
* @param delta The delta to apply.
* @param newImage The new metadata image.
*/
def applyDelta(delta: TopicsDelta, newImage: MetadataImage): Unit = {
// Before taking the lock, compute the local changes
val localChanges = delta.localChanges(config.nodeId)
replicaStateChangeLock.synchronized {
// Handle deleted partitions. We need to do this first because we might subsequently
// create new partitions with the same names as the ones we are deleting here.
if (!localChanges.deletes.isEmpty) {
val deletes = localChanges.deletes.asScala.map(tp => (tp, true)).toMap
stateChangeLogger.info(s"Deleting ${deletes.size} partition(s).")
stopPartitions(deletes).forKeyValue { (topicPartition, e) =>
if (e.isInstanceOf[KafkaStorageException]) {
stateChangeLogger.error(s"Unable to delete replica $topicPartition because " +
"the local replica for the partition is in an offline log directory")
} else {
stateChangeLogger.error(s"Unable to delete replica $topicPartition because " +
s"we got an unexpected ${e.getClass.getName} exception: ${e.getMessage}")
}
}
}
// Handle partitions which we are now the leader or follower for.
if (!localChanges.leaders.isEmpty || !localChanges.followers.isEmpty) {
val lazyOffsetCheckpoints = new LazyOffsetCheckpoints(this.highWatermarkCheckpoints)
val changedPartitions = new mutable.HashSet[Partition]
if (!localChanges.leaders.isEmpty) {
applyLocalLeadersDelta(changedPartitions, delta, lazyOffsetCheckpoints, localChanges.leaders.asScala)
}
if (!localChanges.followers.isEmpty) {
applyLocalFollowersDelta(changedPartitions, newImage, delta, lazyOffsetCheckpoints, localChanges.followers.asScala)
}
maybeAddLogDirFetchers(changedPartitions, lazyOffsetCheckpoints,
name => Option(newImage.topics().getTopic(name)).map(_.id()))
replicaFetcherManager.shutdownIdleFetcherThreads()
replicaAlterLogDirsManager.shutdownIdleFetcherThreads()
}
}
}
private def applyLocalLeadersDelta(
changedPartitions: mutable.Set[Partition],
delta: TopicsDelta,
offsetCheckpoints: OffsetCheckpoints,
localLeaders: mutable.Map[TopicPartition, LocalReplicaChanges.PartitionInfo]
): Unit = {
stateChangeLogger.info(s"Transitioning ${localLeaders.size} partition(s) to " +
"local leaders.")
replicaFetcherManager.removeFetcherForPartitions(localLeaders.keySet)
localLeaders.forKeyValue { (tp, info) =>
getOrCreatePartition(tp, delta, info.topicId).foreach { case (partition, isNew) =>
try {
val state = info.partition.toLeaderAndIsrPartitionState(tp, isNew)
partition.makeLeader(state, offsetCheckpoints, Some(info.topicId))
changedPartitions.add(partition)
} catch {
case e: KafkaStorageException =>
stateChangeLogger.info(s"Skipped the become-leader state change for $tp " +
s"with topic id ${info.topicId} due to a storage error ${e.getMessage}")
// If there is an offline log directory, a Partition object may have been created by
// `getOrCreatePartition()` before `createLogIfNotExists()` failed to create local replica due
// to KafkaStorageException. In this case `ReplicaManager.allPartitions` will map this topic-partition
// to an empty Partition object. We need to map this topic-partition to OfflinePartition instead.
markPartitionOffline(tp)
}
}
}
}
private def applyLocalFollowersDelta(
changedPartitions: mutable.Set[Partition],
newImage: MetadataImage,
delta: TopicsDelta,
offsetCheckpoints: OffsetCheckpoints,
localFollowers: mutable.Map[TopicPartition, LocalReplicaChanges.PartitionInfo]
): Unit = {
stateChangeLogger.info(s"Transitioning ${localFollowers.size} partition(s) to " +
"local followers.")
val partitionsToStartFetching = new mutable.HashMap[TopicPartition, Partition]
val partitionsToStopFetching = new mutable.HashMap[TopicPartition, Boolean]
val followerTopicSet = new mutable.HashSet[String]
localFollowers.forKeyValue { (tp, info) =>
getOrCreatePartition(tp, delta, info.topicId).foreach { case (partition, isNew) =>
try {
followerTopicSet.add(tp.topic)
// We always update the follower state.
// - This ensure that a replica with no leader can step down;
// - This also ensures that the local replica is created even if the leader
// is unavailable. This is required to ensure that we include the partition's
// high watermark in the checkpoint file (see KAFKA-1647).
val state = info.partition.toLeaderAndIsrPartitionState(tp, isNew)
val isNewLeaderEpoch = partition.makeFollower(state, offsetCheckpoints, Some(info.topicId))
if (isInControlledShutdown && (info.partition.leader == NO_LEADER ||
!info.partition.isr.contains(config.brokerId))) {
// During controlled shutdown, replica with no leaders and replica
// where this broker is not in the ISR are stopped.
partitionsToStopFetching.put(tp, false)
} else if (isNewLeaderEpoch) {
// Otherwise, fetcher is restarted if the leader epoch has changed.
partitionsToStartFetching.put(tp, partition)
}
changedPartitions.add(partition)
} catch {
case e: KafkaStorageException =>
stateChangeLogger.error(s"Unable to start fetching $tp " +
s"with topic ID ${info.topicId} due to a storage error ${e.getMessage}", e)
replicaFetcherManager.addFailedPartition(tp)
// If there is an offline log directory, a Partition object may have been created by
// `getOrCreatePartition()` before `createLogIfNotExists()` failed to create local replica due
// to KafkaStorageException. In this case `ReplicaManager.allPartitions` will map this topic-partition
// to an empty Partition object. We need to map this topic-partition to OfflinePartition instead.
markPartitionOffline(tp)
case e: Throwable =>
stateChangeLogger.error(s"Unable to start fetching $tp " +
s"with topic ID ${info.topicId} due to ${e.getClass.getSimpleName}", e)
replicaFetcherManager.addFailedPartition(tp)
}
}
}
if (partitionsToStartFetching.nonEmpty) {
// Stopping the fetchers must be done first in order to initialize the fetch
// position correctly.
replicaFetcherManager.removeFetcherForPartitions(partitionsToStartFetching.keySet)
stateChangeLogger.info(s"Stopped fetchers as part of become-follower for ${partitionsToStartFetching.size} partitions")
val listenerName = config.interBrokerListenerName.value
val partitionAndOffsets = new mutable.HashMap[TopicPartition, InitialFetchState]
partitionsToStartFetching.forKeyValue { (topicPartition, partition) =>
val nodeOpt = partition.leaderReplicaIdOpt
.flatMap(leaderId => Option(newImage.cluster.broker(leaderId)))
.flatMap(_.node(listenerName).asScala)
nodeOpt match {
case Some(node) =>
val log = partition.localLogOrException
partitionAndOffsets.put(topicPartition, InitialFetchState(
log.topicId,
new BrokerEndPoint(node.id, node.host, node.port),
partition.getLeaderEpoch,
initialFetchOffset(log)
))
case None =>
stateChangeLogger.trace(s"Unable to start fetching $topicPartition with topic ID ${partition.topicId} " +
s"from leader ${partition.leaderReplicaIdOpt} because it is not alive.")
}
}
replicaFetcherManager.addFetcherForPartitions(partitionAndOffsets)
stateChangeLogger.info(s"Started fetchers as part of become-follower for ${partitionsToStartFetching.size} partitions")
partitionsToStartFetching.keySet.foreach(completeDelayedFetchOrProduceRequests)
updateLeaderAndFollowerMetrics(followerTopicSet)
}
if (partitionsToStopFetching.nonEmpty) {
stopPartitions(partitionsToStopFetching)
stateChangeLogger.info(s"Stopped fetchers as part of controlled shutdown for ${partitionsToStopFetching.size} partitions")
}
}
def deleteStrayReplicas(topicPartitions: Iterable[TopicPartition]): Unit = {
stopPartitions(topicPartitions.map(tp => tp -> true).toMap).forKeyValue { (topicPartition, exception) =>
exception match {
case e: KafkaStorageException =>
stateChangeLogger.error(s"Unable to delete stray replica $topicPartition because " +
s"the local replica for the partition is in an offline log directory: ${e.getMessage}.")
case e: Throwable =>
stateChangeLogger.error(s"Unable to delete stray replica $topicPartition because " +
s"we got an unexpected ${e.getClass.getName} exception: ${e.getMessage}", e)
}
}
}
}
相关信息
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