[GitHub] [flink] zicat commented on a change in pull request #15247: [FLINK-21833][Table SQL / Runtime] TemporalRowTimeJoinOperator.java will lead to the state expansion by short-life-cycle & huge RowData, although config idle.state.retention.time

[GitBox]

zicat commented on a change in pull request #15247:
URL: https://github.com/apache/flink/pull/15247#discussion_r603744434



##########
File path: 
flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/operators/join/temporal/TemporalRowTimeJoinOperator.java
##########
@@ -209,6 +209,7 @@ public void onEventTime(InternalTimer<Object, 
VoidNamespace> timer) throws Excep
                 registerProcessingCleanupTimer();
             } else {
                 cleanupLastTimer();
+                nextLeftIndex.clear();

Review comment:
       When the program is going into line#211, that means leftState is empty 
and rightState is empty, so cleanupLastTimer() is to delete the cleanup trigger 
for this key. At this time, nextLeftIndexState is not empty(registeredTimer is 
empty because line#201), the nextLeftIndexState will be stored forever because 
clean update trigger have been deleted.
   




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