satishd commented on code in PR #13487:
URL: https://github.com/apache/kafka/pull/13487#discussion_r1158203473
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core/src/main/scala/kafka/log/remote/RemoteLogManager.scala:
##########
@@ -272,15 +364,270 @@ class RemoteLogManager(rlmConfig: RemoteLogManagerConfig,
None
}
+ trait CancellableRunnable extends Runnable {
+ @volatile private var cancelled = false
+
+ def cancel(): Unit = {
+ cancelled = true
+ }
+
+ def isCancelled(): Boolean = {
+ cancelled
+ }
+ }
+
+ /**
+ * Returns the leader epoch checkpoint by truncating with the given
start[exclusive] and end[inclusive] offset
+ *
+ * @param log The actual log from where to take the leader-epoch
checkpoint
+ * @param startOffset The start offset of the checkpoint file (exclusive in
the truncation).
+ * If start offset is 6, then it will retain an entry at
offset 6.
+ * @param endOffset The end offset of the checkpoint file (inclusive in
the truncation)
+ * If end offset is 100, then it will remove the entries
greater than or equal to 100.
+ * @return the truncated leader epoch checkpoint
+ */
+ private[remote] def getLeaderEpochCheckpoint(log: UnifiedLog, startOffset:
Long, endOffset: Long): InMemoryLeaderEpochCheckpoint = {
+ val checkpoint = new InMemoryLeaderEpochCheckpoint()
+ log.leaderEpochCache
+ .map(cache => cache.writeTo(checkpoint))
+ .foreach { x =>
+ if (startOffset >= 0) {
+ x.truncateFromStart(startOffset)
+ }
+ x.truncateFromEnd(endOffset)
+ }
+ checkpoint
+ }
+
+ private[remote] class RLMTask(tpId: TopicIdPartition) extends
CancellableRunnable with Logging {
+ this.logIdent = s"[RemoteLogManager=$brokerId partition=$tpId] "
+ @volatile private var leaderEpoch: Int = -1
+
+ private def isLeader(): Boolean = leaderEpoch >= 0
+
+ // The readOffset is None initially for a new leader RLMTask, and needs to
be fetched inside the task's run() method.
+ @volatile private var copiedOffsetOption: Option[Long] = None
+
+ def convertToLeader(leaderEpochVal: Int): Unit = {
+ if (leaderEpochVal < 0) {
+ throw new KafkaException(s"leaderEpoch value for topic partition $tpId
can not be negative")
+ }
+ if (this.leaderEpoch != leaderEpochVal) {
+ leaderEpoch = leaderEpochVal
+ }
+ // Reset readOffset, so that it is set in next run of RLMTask
+ copiedOffsetOption = None
+ }
+
+ def convertToFollower(): Unit = {
+ leaderEpoch = -1
+ }
+
+ def handleCopyLogSegmentsToRemote(): Unit = {
+ if (isCancelled())
+ return
+
+ def maybeUpdateReadOffset(): Unit = {
+ if (copiedOffsetOption.isEmpty) {
+ info(s"Find the highest remote offset for partition: $tpId after
becoming leader, leaderEpoch: $leaderEpoch")
+
+ // This is found by traversing from the latest leader epoch from
leader epoch history and find the highest offset
+ // of a segment with that epoch copied into remote storage. If it
can not find an entry then it checks for the
+ // previous leader epoch till it finds an entry, If there are no
entries till the earliest leader epoch in leader
+ // epoch cache then it starts copying the segments from the earliest
epoch entry’s offset.
+ copiedOffsetOption = Some(findHighestRemoteOffset(tpId))
+ }
+ }
+
+ try {
+ maybeUpdateReadOffset()
+ val copiedOffset = copiedOffsetOption.get
+ fetchLog(tpId.topicPartition()).foreach { log =>
+ // LSO indicates the offset below are ready to be
consumed(high-watermark or committed)
+ val lso = log.lastStableOffset
+ if (lso < 0) {
+ warn(s"lastStableOffset for partition $tpId is $lso, which should
not be negative.")
+ } else if (lso > 0 && copiedOffset < lso) {
+ // Copy segments only till the min of high-watermark or
stable-offset as remote storage should contain
+ // only committed/acked messages
+ val toOffset = lso
Review Comment:
LastStableOffset already represents that, will update the javadoc comment.
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