[jira] [Created] (FLINK-3178) Make Closing Behavior of Window Operators Configurable

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3178:
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             Summary: Make Closing Behavior of Window Operators Configurable
                 Key: FLINK-3178
                 URL: https://issues.apache.org/jira/browse/FLINK-3178
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek


Right now, all window operators emit (incomplete) in-flight windows when they are closing down. This happens for two reasons:

1. sources emit a final Long.MAX_VALUE watermark to flush out windows when they close.
2. window operators emit in-flight windows in their close() method

For some users this might not be the desired behavior so we should either change it or make it configurable.



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