junrao commented on code in PR #15618:
URL: https://github.com/apache/kafka/pull/15618#discussion_r1543430656
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core/src/main/scala/kafka/log/UnifiedLog.scala:
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@@ -1320,10 +1320,8 @@ class UnifiedLog(@volatile var logStartOffset: Long,
// constant time access while being safe to use with concurrent
collections unlike `toArray`.
val segmentsCopy = logSegments.toBuffer
val latestTimestampSegment = segmentsCopy.maxBy(_.maxTimestampSoFar)
- val latestTimestampAndOffset =
latestTimestampSegment.maxTimestampAndOffsetSoFar
-
- Some(new TimestampAndOffset(latestTimestampAndOffset.timestamp,
- latestTimestampAndOffset.offset,
+ val batch =
latestTimestampSegment.log.batches().asScala.maxBy(_.maxTimestamp())
Review Comment:
@chia7712 :` latestTimestampSegment.log.batches()` scans the whole log
segment and could introduce unnecessary extra I/O. So, there could be
performance degradation because of that.
> Hence we have to use condition baseOffset <= offset <= lastOffset to find
batch.
I am not sure I understand this. Looking up for a batch with each baseOffset
or lastOffset will locate the same batch using the offset index, right?
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