Zakelly Lan created FLINK-36823:
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             Summary: Drain state requests after the user function perform 
snapshotState
                 Key: FLINK-36823
                 URL: https://issues.apache.org/jira/browse/FLINK-36823
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Checkpointing
            Reporter: Zakelly Lan
            Assignee: Zakelly Lan


Currently, the user function of {{KeyedProcessOperator}} would manipulate state 
in {{snapshotState}} (e.g. flush cache into state), which should be included in 
the checkpoint. So we should drain these state requests before snapshot the 
keyed state.



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