jolshan commented on code in PR #15155:
URL: https://github.com/apache/kafka/pull/15155#discussion_r1448132968
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/OffsetMetadataManager.java:
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@@ -195,6 +196,11 @@ public OffsetMetadataManager build() {
*/
private final TimelineHashMap<Long, Offsets> pendingTransactionalOffsets;
+ /**
+ * The open transactions (producer ids) keyed by group.
+ */
+ private final TimelineHashMap<String, TimelineHashSet<Long>>
openTransactionsByGroup;
Review Comment:
Ah its the snapshot registry and revertLastWrittenOffset method that does
this. I had forgotten. But makes sense now.
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