showuon commented on code in PR #15825:
URL: https://github.com/apache/kafka/pull/15825#discussion_r1593331212
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core/src/main/scala/kafka/log/UnifiedLog.scala:
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@@ -1424,11 +1424,18 @@ class UnifiedLog(@volatile var logStartOffset: Long,
/**
* Given a message offset, find its corresponding offset metadata in the
log.
- * If the message offset is out of range, throw an OffsetOutOfRangeException
+ * 1. If the message offset is lesser than the log-start-offset, then throw
an OffsetOutOfRangeException
Review Comment:
For case 1, it looks like we never throw `OffsetOutOfRangeException` now,
doesn't it?
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core/src/main/scala/kafka/server/DelayedFetch.scala:
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@@ -92,7 +92,10 @@ class DelayedFetch(
// has just rolled, then the high watermark offset will remain the
same but be on the old segment,
// which would incorrectly be seen as an instance of Case F.
if (endOffset.messageOffset != fetchOffset.messageOffset) {
- if (endOffset.onOlderSegment(fetchOffset)) {
+ if (endOffset.messageOffsetOnly() ||
fetchOffset.messageOffsetOnly()) {
Review Comment:
I can understand the `endOffset.messageOffsetOnly()` case since the leader's
high watermark is still not updated. But when will `fetchOffset` be
`messageOffsetOnly`?
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