jsancio commented on a change in pull request #9590:
URL: https://github.com/apache/kafka/pull/9590#discussion_r523177211
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File path: core/src/main/scala/kafka/log/Log.scala
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@@ -1306,7 +1309,7 @@ class Log(@volatile private var _dir: File,
// in an unclean manner within
log.flush.start.offset.checkpoint.interval.ms. The chance of this happening is
low.
maybeHandleIOException(s"Exception while increasing log start offset for
$topicPartition to $newLogStartOffset in dir ${dir.getParent}") {
lock synchronized {
- if (newLogStartOffset > highWatermark)
+ if (reason != SegmentCompaction && newLogStartOffset > highWatermark)
Review comment:
I don't think it is safe for replicas to compact past the
`highWatermark`. Should we remove this change and make sure that log compaction
doesn't compact past the `highWatermark`.
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File path: core/src/main/scala/kafka/log/LogCleaner.scala
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@@ -711,6 +723,9 @@ private[log] class Cleaner(val id: Int,
shallowOffsetOfMaxTimestamp = result.shallowOffsetOfMaxTimestamp,
records = retained)
throttler.maybeThrottle(outputBuffer.limit())
+ if (newCanUpdateBaseOffset)
+ dest.updateBaseOffset(result.minOffset())
+ newCanUpdateBaseOffset = false
Review comment:
Can we move this code to `LogSegment::append`? Meaning shouldn't the
`baseOffset` of a segment always be the `baseOffset` of the first record batch
appended?
Is the issue that the new clean segment is created before the log cleaner
knows the first clean record (record batch). If so, why don't we delay creating
of the new segment until that point?
##########
File path: core/src/main/scala/kafka/log/LogCleaner.scala
##########
@@ -538,6 +539,14 @@ private[log] class Cleaner(val id: Int,
for (group <- groupedSegments)
cleanSegments(log, group, offsetMap, deleteHorizonMs, stats,
transactionMetadata)
+ if (baseOffset == log.logStartOffset) {
Review comment:
Why the check? Shouldn't the log cleaner always perform the algorithm in
the `if` block?
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