ocadaruma commented on code in PR #19972:
URL: https://github.com/apache/kafka/pull/19972#discussion_r2153218635


##########
storage/src/main/java/org/apache/kafka/storage/internals/log/LogSegment.java:
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@@ -192,8 +192,13 @@ public void sanityCheck(boolean timeIndexFileNewlyCreated) 
throws IOException {
      * the time index).
      */
     public TimestampOffset readMaxTimestampAndOffsetSoFar() throws IOException 
{
-        if (maxTimestampAndOffsetSoFar == TimestampOffset.UNKNOWN)

Review Comment:
   If we do so, memory map for all segments will be created eagerly at startup 
and make it slow, which we optimized by lazy index before



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