rkhachatryan commented on PR #20091:
URL: https://github.com/apache/flink/pull/20091#issuecomment-1177700779

   I've checked it locally and found that `WindowDistinctAggregateITCase` fails 
with `Exceeded checkpoint tolerable failure threshold`, which is preceeded by 
   ```
    Caused by: org.apache.flink.util.FlinkRuntimeException: The vertex 
GlobalWindowAggregate[28] -> Calc[29] -> LocalWindowAggregate[30] (id = 6853e3e 
e87fc960bbdfeb6fc8a232136) has used UnionListState, but part of its tasks has 
called operators' finish method.
            at 
org.apache.flink.runtime.checkpoint.DefaultCheckpointPlan.checkNoPartlyOperatorsFinishedVertexUsedUnionListState(DefaultCheckpointPlan.
 java:187) ~[classes/:?]
            at 
org.apache.flink.runtime.checkpoint.DefaultCheckpointPlan.fulfillFinishedTaskStatus(DefaultCheckpointPlan.java:138)
 ~[classes/:?]
            at 
org.apache.flink.runtime.checkpoint.PendingCheckpoint.finalizeCheckpoint(PendingCheckpoint.java:323)
 ~[classes/:?]
            at 
org.apache.flink.runtime.checkpoint.CheckpointCoordinator.finalizeCheckpoint(CheckpointCoordinator.java:1356)
 ~[classes/:?]
   ```
   
   @gaoyunhaii 
   Do you know what may be the reason?
   
   It seems unrelated to this change, so I'd open a ticket for investigation 
and temporarily increase `TolerableCheckpointFailureNumber` in the affected 
tests, WDYT?


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