dajac commented on code in PR #15155:
URL: https://github.com/apache/kafka/pull/15155#discussion_r1445797517


##########
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:
   I follow an approach similar to the one used in the scala implementation. We 
basically store the open producer ids per group and use them to search the 
corresponding partitions in `pendingTransactionalOffsets`. An alternative way 
would be to directly store the open transactions by group, topic and partition 
but this would use more space. Classic runtime vs space tradeoff.



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