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KAFKA-19474 Move WARN log on log truncation below HWM (#20106)
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#5608 introduced a regression where the check for `targetOffset <
log.highWatermark`
to emit a `WARN` log was made incorrectly after truncating the log.

This change moves the check for `targetOffset < log.highWatermark`  to
`UnifiedLog#truncateTo` and ensures we emit a `WARN` log on truncation
below  the replica's HWM by both the `ReplicaFetcherThread` and
`ReplicaAlterLogDirsThread`

Reviewers: Jun Rao <junrao@gmail.com>, Chia-Ping Tsai
 <chia7712@gmail.com>
This commit is contained in:
Gaurav Narula 2025-07-09 02:55:02 +01:00 committed by GitHub
parent d86ba7f54a
commit 36b9bb94f1
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GPG Key ID: B5690EEEBB952194
2 changed files with 6 additions and 5 deletions
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5
core/src/main/scala/kafka/server/ReplicaFetcherThread.scala
View File

@ -164,14 +164,9 @@ class ReplicaFetcherThread(name: String,
*/
override def truncate(tp: TopicPartition, offsetTruncationState: OffsetTruncationState): Unit = {
val partition = replicaMgr.getPartitionOrException(tp)
val log = partition.localLogOrException
partition.truncateTo(offsetTruncationState.offset, isFuture = false)
if (offsetTruncationState.offset < log.highWatermark)
warn(s"Truncating $tp to offset ${offsetTruncationState.offset} below high watermark " +
s"${log.highWatermark}")
// mark the future replica for truncation only when we do last truncation
if (offsetTruncationState.truncationCompleted)
replicaMgr.replicaAlterLogDirsManager.markPartitionsForTruncation(brokerConfig.brokerId, tp,

6
storage/src/main/java/org/apache/kafka/storage/internals/log/UnifiedLog.java
View File

@ -2238,6 +2238,12 @@ public class UnifiedLog implements AutoCloseable {
if (targetOffset < 0) {
throw new IllegalArgumentException("Cannot truncate partition " + topicPartition() + " to a negative offset (" + targetOffset + ").");
}
long hwm = highWatermark();
if (targetOffset < hwm) {
logger.warn("Truncating {}{} to offset {} below high watermark {}", isFuture() ? "future " : "", topicPartition(), targetOffset, hwm);
}
if (targetOffset >= localLog.logEndOffset()) {
logger.info("Truncating to {} has no effect as the largest offset in the log is {}", targetOffset, localLog.logEndOffset() - 1);
// Always truncate epoch cache since we may have a conflicting epoch entry at the