kafka LeaderEpochCheckpointFile 源码
kafka LeaderEpochCheckpointFile 代码
文件路径：/core/src/main/scala/kafka/server/checkpoints/LeaderEpochCheckpointFile.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.checkpoints
import kafka.server.LogDirFailureChannel
import kafka.server.epoch.EpochEntry
import org.apache.kafka.server.common.CheckpointFile.EntryFormatter
import java.io._
import java.util.Optional
import java.util.regex.Pattern
import scala.collection._
trait LeaderEpochCheckpoint {
def write(epochs: Iterable[EpochEntry]): Unit
def read(): Seq[EpochEntry]
}
object LeaderEpochCheckpointFile {
private val LeaderEpochCheckpointFilename = "leader-epoch-checkpoint"
private val WhiteSpacesPattern = Pattern.compile("\\s+")
private val CurrentVersion = 0
def newFile(dir: File): File = new File(dir, LeaderEpochCheckpointFilename)
object Formatter extends EntryFormatter[EpochEntry] {
override def toString(entry: EpochEntry): String = s"${entry.epoch} ${entry.startOffset}"
override def fromString(line: String): Optional[EpochEntry] = {
WhiteSpacesPattern.split(line) match {
case Array(epoch, offset) =>
Optional.of(EpochEntry(epoch.toInt, offset.toLong))
case _ => Optional.empty()
}
}
}
}
/**
* This class persists a map of (LeaderEpoch => Offsets) to a file (for a certain replica)
*
* The format in the LeaderEpoch checkpoint file is like this:
* -----checkpoint file begin------
* 0 <- LeaderEpochCheckpointFile.currentVersion
* 2 <- following entries size
* 0 1 <- the format is: leader_epoch(int32) start_offset(int64)
* 1 2
* -----checkpoint file end----------
*/
class LeaderEpochCheckpointFile(val file: File, logDirFailureChannel: LogDirFailureChannel = null) extends LeaderEpochCheckpoint {
import LeaderEpochCheckpointFile._
val checkpoint = new CheckpointFileWithFailureHandler[EpochEntry](file, CurrentVersion, Formatter, logDirFailureChannel, file.getParentFile.getParent)
def write(epochs: Iterable[EpochEntry]): Unit = checkpoint.write(epochs)
def read(): Seq[EpochEntry] = checkpoint.read()
}
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