hachikuji commented on a change in pull request #9590:
URL: https://github.com/apache/kafka/pull/9590#discussion_r610168018



##########
File path: core/src/main/scala/kafka/log/Log.scala
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@@ -2393,6 +2407,10 @@ class Log(@volatile private var _dir: File,
       }
       // okay we are safe now, remove the swap suffix
       sortedNewSegments.foreach(_.changeFileSuffixes(Log.SwapFileSuffix, ""))
+
+      // If not recovered swap file we need to increment logStartOffset here. 
Otherwise, we do this when loading the log.
+      if (!isRecoveredSwapFile)
+         maybeIncrementLogStartOffset(segments.firstEntry.getValue.baseOffset, 
LogCompaction)

Review comment:
       What I am referring to is the use of the `LogCompaction` reason passed 
to `maybeIncrementLogStartOffset`. I believe this logic also applies when 
splitting a segment and that does not involve compaction.




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