satishd commented on code in PR #13561:
URL: https://github.com/apache/kafka/pull/13561#discussion_r1289488513


##########
core/src/main/scala/kafka/log/UnifiedLog.scala:
##########
@@ -1390,7 +1424,15 @@ class UnifiedLog(@volatile var logStartOffset: Long,
   private def deleteOldSegments(predicate: (LogSegment, Option[LogSegment]) => 
Boolean,
                                 reason: SegmentDeletionReason): Int = {
     def shouldDelete(segment: LogSegment, nextSegmentOpt: Option[LogSegment]): 
Boolean = {
-      highWatermark >= 
nextSegmentOpt.map(_.baseOffset).getOrElse(localLog.logEndOffset) &&
+      val upperBoundOffset = 
nextSegmentOpt.map(_.baseOffset).getOrElse(localLog.logEndOffset)
+
+      // Check not to delete segments which are not yet copied to tiered 
storage
+      val isSegmentTieredToRemoteStorage =
+        if (remoteLogEnabled()) upperBoundOffset > 0 && upperBoundOffset - 1 
<= highestOffsetInRemoteStorage
+        else true

Review Comment:
   No, this should be true if the remote storage is not enabled as this segment 
should be eligible based on other checks like `highWatermark >= 
upperBoundOffset && predicate(segment, nextSegmentOpt)`. Existing tests in 
`UnifiedLogTest`, `LogOffsetTest`, `LogLoaderTest`, `LogCleanerTest` already 
cover those scenarios.



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