kamalcph commented on code in PR #15817: URL: https://github.com/apache/kafka/pull/15817#discussion_r1589055167
########## core/src/main/java/kafka/log/remote/RemoteLogManager.java: ########## @@ -1217,26 +1217,41 @@ public String toString() { * @return true if the remote segment's epoch/offsets are within the leader epoch lineage of the partition. */ // Visible for testing - public static boolean isRemoteSegmentWithinLeaderEpochs(RemoteLogSegmentMetadata segmentMetadata, - long logEndOffset, - NavigableMap<Integer, Long> leaderEpochs) { + static boolean isRemoteSegmentWithinLeaderEpochs(RemoteLogSegmentMetadata segmentMetadata, + long logEndOffset, + NavigableMap<Integer, Long> leaderEpochs) { long segmentEndOffset = segmentMetadata.endOffset(); // Filter epochs that does not have any messages/records associated with them. NavigableMap<Integer, Long> segmentLeaderEpochs = buildFilteredLeaderEpochMap(segmentMetadata.segmentLeaderEpochs()); // Check for out of bound epochs between segment epochs and current leader epochs. - Integer segmentFirstEpoch = segmentLeaderEpochs.firstKey(); Integer segmentLastEpoch = segmentLeaderEpochs.lastKey(); - if (segmentFirstEpoch < leaderEpochs.firstKey() || segmentLastEpoch > leaderEpochs.lastKey()) { + if (segmentLastEpoch < leaderEpochs.firstKey() || segmentLastEpoch > leaderEpochs.lastKey()) { + LOGGER.debug("Segment {} is not within the partition leader epoch lineage. " + + "Remote segment epochs: {} and partition leader epochs: {}", + segmentMetadata.remoteLogSegmentId(), segmentLeaderEpochs, leaderEpochs); + return false; + } + // There can be overlapping remote log segments in the remote storage. (eg) + // leader-epoch-file-cache: {(5, 10), (7, 15), (9, 100)} + // segment1: offset-range = 5-50, Broker = 0, epochs = {(5, 10), (7, 15)} + // segment2: offset-range = 14-150, Broker = 1, epochs = {(5, 14), (7, 15), (9, 100)}, after leader-election. Review Comment: Given that we roll the log based on `log.roll.ms` and the server startup time can vary between the replicas, this is quite common. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org