kowshik commented on a change in pull request #10280:
URL: https://github.com/apache/kafka/pull/10280#discussion_r602062784



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File path: core/src/main/scala/kafka/log/Log.scala
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@@ -1816,8 +1292,12 @@ class Log(@volatile private var _dir: File,
    */
   private def deleteOldSegments(predicate: (LogSegment, Option[LogSegment]) => 
Boolean,
                                 reason: SegmentDeletionReason): Int = {
+    def shouldDelete(segment: LogSegment, nextSegmentOpt: Option[LogSegment], 
logEndOffset: Long): Boolean = {
+      highWatermark >= 
nextSegmentOpt.map(_.baseOffset).getOrElse(logEndOffset) &&

Review comment:
       This is to accomodate for the hwm check that was previously happening in 
`Log#deletableSegments` in this 
[line](https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/log/Log.scala#L1872).
 The `deletableSegments` method has now moved to `LocalLog`, but we can't do 
the hwm check inside `LocalLog` since hwm is still owned by `Log`. So we 
piggyback on the predicate here to additionally attach the hwm check.




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