chia7712 commented on code in PR #15621:
URL: https://github.com/apache/kafka/pull/15621#discussion_r1548765182
##########
core/src/main/scala/kafka/log/UnifiedLog.scala:
##########
@@ -1337,13 +1337,17 @@ class UnifiedLog(@volatile var logStartOffset: Long,
} else if (targetTimestamp == ListOffsetsRequest.MAX_TIMESTAMP) {
// Cache to avoid race conditions. `toBuffer` is faster than most
alternatives and provides
// constant time access while being safe to use with concurrent
collections unlike `toArray`.
- val segmentsCopy = logSegments.asScala.toBuffer
- val latestTimestampSegment = segmentsCopy.maxBy(_.maxTimestampSoFar)
- val latestTimestampAndOffset =
latestTimestampSegment.readMaxTimestampAndOffsetSoFar
-
- Some(new TimestampAndOffset(latestTimestampAndOffset.timestamp,
- latestTimestampAndOffset.offset,
- latestEpochAsOptional(leaderEpochCache)))
+ val latestTimestampSegment =
logSegments.asScala.toBuffer.maxBy[Long](_.maxTimestampSoFar)
+ // cache the timestamp and offset
+ val maxTimestampSoFar =
latestTimestampSegment.readMaxTimestampAndOffsetSoFar
+ // lookup the position of batch to avoid extra I/O
+ val position =
latestTimestampSegment.offsetIndex.lookup(maxTimestampSoFar.offset)
+ val lpc = latestEpochAsOptional(leaderEpochCache)
+ Some(latestTimestampSegment.log.batchesFrom(position.position).asScala
+ .find(_.maxTimestamp() == maxTimestampSoFar.timestamp)
+ .flatMap(batch => batch.offsetOfMaxTimestamp().asScala.map(new
TimestampAndOffset(batch.maxTimestamp(), _, lpc)))
+ // return the base offset for backward compatibility if there is no
batches
+ .getOrElse(new TimestampAndOffset(RecordBatch.NO_TIMESTAMP,
latestTimestampSegment.baseOffset(), lpc)))
Review Comment:
sure.
https://github.com/apache/kafka/pull/15621/commits/8a7ed30692bd070fb4160a6cbc76a868484529c3
return none and add related test
--
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
