[jira] [Created] (FLINK-21839) SinkFunction snapshotState don't snapshot all data when trigger a stop-with-drain savepoint

[Darcy Lin (Jira)]

Darcy Lin created FLINK-21839:
---------------------------------

             Summary: SinkFunction snapshotState don't snapshot all data when 
trigger a stop-with-drain savepoint
                 Key: FLINK-21839
                 URL: https://issues.apache.org/jira/browse/FLINK-21839
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing
    Affects Versions: 1.12.2
            Reporter: Darcy Lin
         Attachments: TestSink.java

This problem was discovered when I was developing the flink code. In my flink 
code, my custom sink don't send all data that be produced by event_time window 
when trigger stop-with-drain savepoint .

TestSink.java is a example that SinkFunction invoke() continues to run after 
snapshotState() executed when trigger a stop-with-drain savepoint by rest api.
{code:java}
//TaskSink.java log
sink open
invoke: 0
invoke: 1
invoke: 2
invoke: 3
invoke: 4
invoke: 5
invoke: 6
invoke: 7
invoke: 8
invoke: 9
...
invoke: 425
invoke: 426
invoke: 427
snapshotState
invoke: 428 // It should be executed before snapshotState.
sink close{code}



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