squah-confluent commented on code in PR #19497:
URL: https://github.com/apache/kafka/pull/19497#discussion_r2047531203
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/OffsetMetadataManager.java:
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@@ -194,9 +194,16 @@ public OffsetMetadataManager build() {
/**
* The open transactions (producer ids) keyed by group.
+ * Tracks whether groups have any open transactions.
*/
private final TimelineHashMap<String, TimelineHashSet<Long>>
openTransactionsByGroup;
Review Comment:
I wanted to replace this map entirely, but we use it in
`cleanupExpiredOffsets` to check whether a group has any pending transactions.
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