kowshik commented on a change in pull request #11345:
URL: https://github.com/apache/kafka/pull/11345#discussion_r719800036



##########
File path: core/src/main/scala/kafka/log/LogSegment.scala
##########
@@ -77,8 +77,9 @@ class LogSegment private[log] (val log: FileRecords,
     timeIndex.resize(size)
   }
 
-  def sanityCheck(timeIndexFileNewlyCreated: Boolean): Unit = {
-    if (lazyOffsetIndex.file.exists) {
+  def sanityCheck(timeIndexFileNewlyCreated: Boolean, isActiveSegment: 
Boolean): Unit = {
+    // We allow for absence of offset index file only for an empty active 
segment.
+    if ((isActiveSegment && size == 0) || lazyOffsetIndex.file.exists) {

Review comment:
       @ccding When we roll a segment, we explicitly ensure to flush only the 
old segment. See [this 
LOC](https://github.com/apache/kafka/blob/c6aeb5c5546f34276879c1eef4199d208f1c23dc/core/src/main/scala/kafka/log/UnifiedLog.scala#L1501).




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