spark KafkaOffsetReaderAdmin 源码
spark KafkaOffsetReaderAdmin 代码
文件路径：/connector/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaOffsetReaderAdmin.scala
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* 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
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
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package org.apache.spark.sql.kafka010
import java.{util => ju}
import java.util.Locale
import scala.collection.JavaConverters._
import scala.collection.mutable.ArrayBuffer
import scala.util.control.NonFatal
import org.apache.kafka.clients.admin.{Admin, ListOffsetsOptions, ListOffsetsResult, OffsetSpec}
import org.apache.kafka.clients.consumer.ConsumerConfig
import org.apache.kafka.common.{IsolationLevel, TopicPartition}
import org.apache.kafka.common.requests.OffsetFetchResponse
import org.apache.spark.SparkEnv
import org.apache.spark.internal.Logging
import org.apache.spark.scheduler.ExecutorCacheTaskLocation
import org.apache.spark.sql.catalyst.util.CaseInsensitiveMap
import org.apache.spark.sql.kafka010.KafkaSourceProvider.StrategyOnNoMatchStartingOffset
/**
* This class uses Kafka's own [[Admin]] API to read data offsets from Kafka.
* The [[ConsumerStrategy]] class defines which Kafka topics and partitions should be read
* by this source. These strategies directly correspond to the different consumption options
* in. This class is designed to return a configured [[Admin]] that is used by the
* [[KafkaSource]] to query for the offsets. See the docs on
* [[org.apache.spark.sql.kafka010.ConsumerStrategy]]
* for more details.
*
* Note: This class is not ThreadSafe
*/
private[kafka010] class KafkaOffsetReaderAdmin(
consumerStrategy: ConsumerStrategy,
override val driverKafkaParams: ju.Map[String, Object],
readerOptions: CaseInsensitiveMap[String],
driverGroupIdPrefix: String) extends KafkaOffsetReader with Logging {
private[kafka010] val maxOffsetFetchAttempts =
readerOptions.getOrElse(KafkaSourceProvider.FETCH_OFFSET_NUM_RETRY, "3").toInt
private[kafka010] val offsetFetchAttemptIntervalMs =
readerOptions.getOrElse(KafkaSourceProvider.FETCH_OFFSET_RETRY_INTERVAL_MS, "1000").toLong
/**
* An AdminClient used in the driver to query the latest Kafka offsets.
* This only queries the offsets because AdminClient has no functionality to commit offsets like
* KafkaConsumer.
*/
@volatile protected var _admin: Admin = null
protected def admin: Admin = synchronized {
if (_admin == null) {
_admin = consumerStrategy.createAdmin(driverKafkaParams)
}
_admin
}
lazy val isolationLevel: IsolationLevel = {
Option(driverKafkaParams.get(ConsumerConfig.ISOLATION_LEVEL_CONFIG)) match {
case Some(s: String) => IsolationLevel.valueOf(s.toUpperCase(Locale.ROOT))
case None => IsolationLevel.valueOf(
ConsumerConfig.DEFAULT_ISOLATION_LEVEL.toUpperCase(Locale.ROOT))
case _ => throw new IllegalArgumentException(s"${ConsumerConfig.ISOLATION_LEVEL_CONFIG} " +
"must be either not defined or with type String")
}
}
private lazy val listOffsetsOptions = new ListOffsetsOptions(isolationLevel)
private def listOffsets(admin: Admin, listOffsetsParams: ju.Map[TopicPartition, OffsetSpec]) = {
admin.listOffsets(listOffsetsParams, listOffsetsOptions).all().get().asScala
.map(result => result._1 -> result._2.offset()).toMap
}
/**
* Number of partitions to read from Kafka. If this value is greater than the number of Kafka
* topicPartitions, we will split up the read tasks of the skewed partitions to multiple Spark
* tasks. The number of Spark tasks will be *approximately* `numPartitions`. It can be less or
* more depending on rounding errors or Kafka partitions that didn't receive any new data.
*/
private val minPartitions =
readerOptions.get(KafkaSourceProvider.MIN_PARTITIONS_OPTION_KEY).map(_.toInt)
private val rangeCalculator = new KafkaOffsetRangeCalculator(minPartitions)
/**
* Whether we should divide Kafka TopicPartitions with a lot of data into smaller Spark tasks.
*/
private def shouldDivvyUpLargePartitions(numTopicPartitions: Int): Boolean = {
minPartitions.map(_ > numTopicPartitions).getOrElse(false)
}
override def toString(): String = consumerStrategy.toString
override def close(): Unit = {
stopAdmin()
}
override def fetchPartitionOffsets(
offsetRangeLimit: KafkaOffsetRangeLimit,
isStartingOffsets: Boolean): Map[TopicPartition, Long] = {
def validateTopicPartitions(partitions: Set[TopicPartition],
partitionOffsets: Map[TopicPartition, Long]): Map[TopicPartition, Long] = {
assert(partitions == partitionOffsets.keySet,
"If startingOffsets contains specific offsets, you must specify all TopicPartitions.\n" +
"Use -1 for latest, -2 for earliest.\n" +
s"Specified: ${partitionOffsets.keySet} Assigned: ${partitions}")
logDebug(s"Assigned partitions: $partitions. Seeking to $partitionOffsets")
partitionOffsets
}
val partitions = consumerStrategy.assignedTopicPartitions(admin)
// Obtain TopicPartition offsets with late binding support
offsetRangeLimit match {
case EarliestOffsetRangeLimit => partitions.map {
case tp => tp -> KafkaOffsetRangeLimit.EARLIEST
}.toMap
case LatestOffsetRangeLimit => partitions.map {
case tp => tp -> KafkaOffsetRangeLimit.LATEST
}.toMap
case SpecificOffsetRangeLimit(partitionOffsets) =>
validateTopicPartitions(partitions, partitionOffsets)
case SpecificTimestampRangeLimit(partitionTimestamps, strategyOnNoMatchingStartingOffset) =>
fetchSpecificTimestampBasedOffsets(partitionTimestamps, isStartingOffsets,
strategyOnNoMatchingStartingOffset).partitionToOffsets
case GlobalTimestampRangeLimit(timestamp, strategyOnNoMatchingStartingOffset) =>
fetchGlobalTimestampBasedOffsets(timestamp, isStartingOffsets,
strategyOnNoMatchingStartingOffset).partitionToOffsets
}
}
override def fetchSpecificOffsets(
partitionOffsets: Map[TopicPartition, Long],
reportDataLoss: String => Unit): KafkaSourceOffset = {
val fnAssertParametersWithPartitions: ju.Set[TopicPartition] => Unit = { partitions =>
assert(partitions.asScala == partitionOffsets.keySet,
"If startingOffsets contains specific offsets, you must specify all TopicPartitions.\n" +
"Use -1 for latest, -2 for earliest, if you don't care.\n" +
s"Specified: ${partitionOffsets.keySet} Assigned: ${partitions.asScala}")
logDebug(s"Assigned partitions: $partitions. Seeking to $partitionOffsets")
}
val fnRetrievePartitionOffsets: ju.Set[TopicPartition] => Map[TopicPartition, Long] = { _ =>
partitionOffsets
}
fetchSpecificOffsets0(fnAssertParametersWithPartitions, fnRetrievePartitionOffsets)
}
override def fetchSpecificTimestampBasedOffsets(
partitionTimestamps: Map[TopicPartition, Long],
isStartingOffsets: Boolean,
strategyOnNoMatchStartingOffset: StrategyOnNoMatchStartingOffset.Value)
: KafkaSourceOffset = {
val fnAssertParametersWithPartitions: ju.Set[TopicPartition] => Unit = { partitions =>
assert(partitions.asScala == partitionTimestamps.keySet,
"If starting/endingOffsetsByTimestamp contains specific offsets, you must specify all " +
s"topics. Specified: ${partitionTimestamps.keySet} Assigned: ${partitions.asScala}")
logDebug(s"Assigned partitions: $partitions. Seeking to $partitionTimestamps")
}
val fnRetrievePartitionOffsets: ju.Set[TopicPartition] => Map[TopicPartition, Long] = { _ =>
val listOffsetsParams = partitionTimestamps.map { case (tp, timestamp) =>
tp -> OffsetSpec.forTimestamp(timestamp)
}.asJava
readTimestampOffsets(
admin.listOffsets(listOffsetsParams, listOffsetsOptions).all().get().asScala.toMap,
isStartingOffsets,
strategyOnNoMatchStartingOffset,
partitionTimestamps)
}
fetchSpecificOffsets0(fnAssertParametersWithPartitions, fnRetrievePartitionOffsets)
}
override def fetchGlobalTimestampBasedOffsets(
timestamp: Long,
isStartingOffsets: Boolean,
strategyOnNoMatchStartingOffset: StrategyOnNoMatchStartingOffset.Value)
: KafkaSourceOffset = {
val fnAssertParametersWithPartitions: ju.Set[TopicPartition] => Unit = { partitions =>
logDebug(s"Partitions assigned to consumer: $partitions. Seeking to $timestamp")
}
val fnRetrievePartitionOffsets: ju.Set[TopicPartition] => Map[TopicPartition, Long] = { tps =>
val listOffsetsParams = tps.asScala.map { tp =>
tp -> OffsetSpec.forTimestamp(timestamp)
}.toMap.asJava
readTimestampOffsets(
admin.listOffsets(listOffsetsParams, listOffsetsOptions).all().get().asScala.toMap,
isStartingOffsets,
strategyOnNoMatchStartingOffset,
_ => timestamp
)
}
fetchSpecificOffsets0(fnAssertParametersWithPartitions, fnRetrievePartitionOffsets)
}
private def readTimestampOffsets(
tpToOffsetMap: Map[TopicPartition, ListOffsetsResult.ListOffsetsResultInfo],
isStartingOffsets: Boolean,
strategyOnNoMatchStartingOffset: StrategyOnNoMatchStartingOffset.Value,
partitionTimestampFn: TopicPartition => Long): Map[TopicPartition, Long] = {
tpToOffsetMap.map { case (tp, offsetSpec) =>
val offset = if (offsetSpec.offset() == OffsetFetchResponse.INVALID_OFFSET) {
if (isStartingOffsets) {
strategyOnNoMatchStartingOffset match {
case StrategyOnNoMatchStartingOffset.ERROR =>
throw new IllegalArgumentException("No offset " +
s"matched from request of topic-partition $tp and timestamp " +
s"${partitionTimestampFn(tp)}.")
case StrategyOnNoMatchStartingOffset.LATEST =>
KafkaOffsetRangeLimit.LATEST
}
} else {
KafkaOffsetRangeLimit.LATEST
}
} else {
offsetSpec.offset()
}
tp -> offset
}.toMap
}
private def fetchSpecificOffsets0(
fnAssertParametersWithPartitions: ju.Set[TopicPartition] => Unit,
fnRetrievePartitionOffsets: ju.Set[TopicPartition] => Map[TopicPartition, Long]
): KafkaSourceOffset = {
val fetched = partitionsAssignedToAdmin {
partitions => {
fnAssertParametersWithPartitions(partitions)
val partitionOffsets = fnRetrievePartitionOffsets(partitions)
val listOffsetsParams = partitionOffsets.filter { case (_, off) =>
off == KafkaOffsetRangeLimit.LATEST || off == KafkaOffsetRangeLimit.EARLIEST
}.map { case (tp, off) =>
off match {
case KafkaOffsetRangeLimit.LATEST =>
tp -> OffsetSpec.latest()
case KafkaOffsetRangeLimit.EARLIEST =>
tp -> OffsetSpec.earliest()
}
}
val resolvedPartitionOffsets = listOffsets(admin, listOffsetsParams.asJava)
partitionOffsets.map { case (tp, off) =>
off match {
case KafkaOffsetRangeLimit.LATEST =>
tp -> resolvedPartitionOffsets(tp)
case KafkaOffsetRangeLimit.EARLIEST =>
tp -> resolvedPartitionOffsets(tp)
case _ =>
tp -> off
}
}
}
}
KafkaSourceOffset(fetched)
}
override def fetchEarliestOffsets(): Map[TopicPartition, Long] = partitionsAssignedToAdmin(
partitions => {
val listOffsetsParams = partitions.asScala.map(p => p -> OffsetSpec.earliest()).toMap.asJava
val partitionOffsets = listOffsets(admin, listOffsetsParams)
logDebug(s"Got earliest offsets for partitions: $partitionOffsets")
partitionOffsets
})
override def fetchLatestOffsets(
knownOffsets: Option[PartitionOffsetMap]): PartitionOffsetMap =
partitionsAssignedToAdmin { partitions => {
val listOffsetsParams = partitions.asScala.map(_ -> OffsetSpec.latest()).toMap.asJava
if (knownOffsets.isEmpty) {
val partitionOffsets = listOffsets(admin, listOffsetsParams)
logDebug(s"Got latest offsets for partitions: $partitionOffsets")
partitionOffsets
} else {
var partitionOffsets: PartitionOffsetMap = Map.empty
/**
* Compare `knownOffsets` and `partitionOffsets`. Returns all partitions that have incorrect
* latest offset (offset in `knownOffsets` is great than the one in `partitionOffsets`).
*/
def findIncorrectOffsets(): Seq[(TopicPartition, Long, Long)] = {
val incorrectOffsets = ArrayBuffer[(TopicPartition, Long, Long)]()
partitionOffsets.foreach { case (tp, offset) =>
knownOffsets.foreach(_.get(tp).foreach { knownOffset =>
if (knownOffset > offset) {
val incorrectOffset = (tp, knownOffset, offset)
incorrectOffsets += incorrectOffset
}
})
}
// toSeq seems redundant but it's needed for Scala 2.13
incorrectOffsets.toSeq
}
// Retry to fetch latest offsets when detecting incorrect offsets. We don't use
// `withRetries` to retry because:
//
// - `withRetries` will reset the admin for each attempt but a fresh
// admin has a much bigger chance to hit KAFKA-7703 like issues.
var incorrectOffsets: Seq[(TopicPartition, Long, Long)] = Nil
var attempt = 0
do {
partitionOffsets = listOffsets(admin, listOffsetsParams)
attempt += 1
incorrectOffsets = findIncorrectOffsets()
if (incorrectOffsets.nonEmpty) {
logWarning("Found incorrect offsets in some partitions " +
s"(partition, previous offset, fetched offset): $incorrectOffsets")
if (attempt < maxOffsetFetchAttempts) {
logWarning("Retrying to fetch latest offsets because of incorrect offsets")
Thread.sleep(offsetFetchAttemptIntervalMs)
}
}
} while (incorrectOffsets.nonEmpty && attempt < maxOffsetFetchAttempts)
logDebug(s"Got latest offsets for partitions: $partitionOffsets")
partitionOffsets
}
}
}
override def fetchEarliestOffsets(
newPartitions: Seq[TopicPartition]): Map[TopicPartition, Long] = {
if (newPartitions.isEmpty) {
Map.empty[TopicPartition, Long]
} else {
partitionsAssignedToAdmin(partitions => {
// Get the earliest offset of each partition
val listOffsetsParams = newPartitions.filter { newPartition =>
// When deleting topics happen at the same time, some partitions may not be in
// `partitions`. So we need to ignore them
partitions.contains(newPartition)
}.map(partition => partition -> OffsetSpec.earliest()).toMap.asJava
val partitionOffsets = listOffsets(admin, listOffsetsParams)
logDebug(s"Got earliest offsets for new partitions: $partitionOffsets")
partitionOffsets
})
}
}
override def getOffsetRangesFromUnresolvedOffsets(
startingOffsets: KafkaOffsetRangeLimit,
endingOffsets: KafkaOffsetRangeLimit): Seq[KafkaOffsetRange] = {
val fromPartitionOffsets = fetchPartitionOffsets(startingOffsets, isStartingOffsets = true)
val untilPartitionOffsets = fetchPartitionOffsets(endingOffsets, isStartingOffsets = false)
// Obtain topicPartitions in both from and until partition offset, ignoring
// topic partitions that were added and/or deleted between the two above calls.
if (fromPartitionOffsets.keySet != untilPartitionOffsets.keySet) {
implicit val topicOrdering: Ordering[TopicPartition] = Ordering.by(t => t.topic())
val fromTopics = fromPartitionOffsets.keySet.toList.sorted.mkString(",")
val untilTopics = untilPartitionOffsets.keySet.toList.sorted.mkString(",")
throw new IllegalStateException("different topic partitions " +
s"for starting offsets topics[${fromTopics}] and " +
s"ending offsets topics[${untilTopics}]")
}
// Calculate offset ranges
val offsetRangesBase = untilPartitionOffsets.keySet.map { tp =>
val fromOffset = fromPartitionOffsets.getOrElse(tp,
// This should not happen since topicPartitions contains all partitions not in
// fromPartitionOffsets
throw new IllegalStateException(s"$tp doesn't have a from offset")
)
val untilOffset = untilPartitionOffsets(tp)
KafkaOffsetRange(tp, fromOffset, untilOffset, None)
}.toSeq
if (shouldDivvyUpLargePartitions(offsetRangesBase.size)) {
val fromOffsetsMap =
offsetRangesBase.map(range => (range.topicPartition, range.fromOffset)).toMap
val untilOffsetsMap =
offsetRangesBase.map(range => (range.topicPartition, range.untilOffset)).toMap
// No need to report data loss here
val resolvedFromOffsets = fetchSpecificOffsets(fromOffsetsMap, _ => ()).partitionToOffsets
val resolvedUntilOffsets = fetchSpecificOffsets(untilOffsetsMap, _ => ()).partitionToOffsets
val ranges = offsetRangesBase.map(_.topicPartition).map { tp =>
KafkaOffsetRange(tp, resolvedFromOffsets(tp), resolvedUntilOffsets(tp), preferredLoc = None)
}
val divvied = rangeCalculator.getRanges(ranges).groupBy(_.topicPartition)
divvied.flatMap { case (tp, splitOffsetRanges) =>
if (splitOffsetRanges.length == 1) {
Seq(KafkaOffsetRange(tp, fromOffsetsMap(tp), untilOffsetsMap(tp), None))
} else {
// the list can't be empty
val first = splitOffsetRanges.head.copy(fromOffset = fromOffsetsMap(tp))
val end = splitOffsetRanges.last.copy(untilOffset = untilOffsetsMap(tp))
Seq(first) ++ splitOffsetRanges.drop(1).dropRight(1) :+ end
}
}.toArray.toSeq
} else {
offsetRangesBase
}
}
private def getSortedExecutorList: Array[String] = {
def compare(a: ExecutorCacheTaskLocation, b: ExecutorCacheTaskLocation): Boolean = {
if (a.host == b.host) {
a.executorId > b.executorId
} else {
a.host > b.host
}
}
val bm = SparkEnv.get.blockManager
bm.master.getPeers(bm.blockManagerId).toArray
.map(x => ExecutorCacheTaskLocation(x.host, x.executorId))
.sortWith(compare)
.map(_.toString)
}
override def getOffsetRangesFromResolvedOffsets(
fromPartitionOffsets: PartitionOffsetMap,
untilPartitionOffsets: PartitionOffsetMap,
reportDataLoss: String => Unit): Seq[KafkaOffsetRange] = {
// Find the new partitions, and get their earliest offsets
val newPartitions = untilPartitionOffsets.keySet.diff(fromPartitionOffsets.keySet)
val newPartitionInitialOffsets = fetchEarliestOffsets(newPartitions.toSeq)
if (newPartitionInitialOffsets.keySet != newPartitions) {
// We cannot get from offsets for some partitions. It means they got deleted.
val deletedPartitions = newPartitions.diff(newPartitionInitialOffsets.keySet)
reportDataLoss(
s"Cannot find earliest offsets of ${deletedPartitions}. Some data may have been missed")
}
logInfo(s"Partitions added: $newPartitionInitialOffsets")
newPartitionInitialOffsets.filter(_._2 != 0).foreach { case (p, o) =>
reportDataLoss(
s"Added partition $p starts from $o instead of 0. Some data may have been missed")
}
val deletedPartitions = fromPartitionOffsets.keySet.diff(untilPartitionOffsets.keySet)
if (deletedPartitions.nonEmpty) {
val message = if (driverKafkaParams.containsKey(ConsumerConfig.GROUP_ID_CONFIG)) {
s"$deletedPartitions are gone. ${KafkaSourceProvider.CUSTOM_GROUP_ID_ERROR_MESSAGE}"
} else {
s"$deletedPartitions are gone. Some data may have been missed."
}
reportDataLoss(message)
}
// Use the until partitions to calculate offset ranges to ignore partitions that have
// been deleted
val topicPartitions = untilPartitionOffsets.keySet.filter { tp =>
// Ignore partitions that we don't know the from offsets.
newPartitionInitialOffsets.contains(tp) || fromPartitionOffsets.contains(tp)
}.toSeq
logDebug("TopicPartitions: " + topicPartitions.mkString(", "))
val fromOffsets = fromPartitionOffsets ++ newPartitionInitialOffsets
val untilOffsets = untilPartitionOffsets
val ranges = topicPartitions.map { tp =>
val fromOffset = fromOffsets(tp)
val untilOffset = untilOffsets(tp)
if (untilOffset < fromOffset) {
reportDataLoss(s"Partition $tp's offset was changed from " +
s"$fromOffset to $untilOffset, some data may have been missed")
}
KafkaOffsetRange(tp, fromOffset, untilOffset, preferredLoc = None)
}
rangeCalculator.getRanges(ranges, getSortedExecutorList)
}
private def partitionsAssignedToAdmin(
body: ju.Set[TopicPartition] => Map[TopicPartition, Long])
: Map[TopicPartition, Long] = {
withRetries {
val partitions = consumerStrategy.assignedTopicPartitions(admin).asJava
logDebug(s"Partitions assigned: $partitions.")
body(partitions)
}
}
/**
* Helper function that does multiple retries on a body of code that returns offsets.
* Retries are needed to handle transient failures. For e.g. race conditions between getting
* assignment and getting position while topics/partitions are deleted can cause NPEs.
*/
private def withRetries(body: => Map[TopicPartition, Long]): Map[TopicPartition, Long] = {
synchronized {
var result: Option[Map[TopicPartition, Long]] = None
var attempt = 1
var lastException: Throwable = null
while (result.isEmpty && attempt <= maxOffsetFetchAttempts
&& !Thread.currentThread().isInterrupted) {
try {
result = Some(body)
} catch {
case NonFatal(e) =>
lastException = e
logWarning(s"Error in attempt $attempt getting Kafka offsets: ", e)
attempt += 1
Thread.sleep(offsetFetchAttemptIntervalMs)
resetAdmin()
}
}
if (Thread.interrupted()) {
throw new InterruptedException()
}
if (result.isEmpty) {
assert(attempt > maxOffsetFetchAttempts)
assert(lastException != null)
throw lastException
}
result.get
}
}
private def stopAdmin(): Unit = synchronized {
if (_admin != null) _admin.close()
}
private def resetAdmin(): Unit = synchronized {
stopAdmin()
_admin = null // will automatically get reinitialized again
}
}
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