[jira] [Created] (FLINK-3614) Remove Non-Keyed Window Operator

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3614:
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             Summary: Remove Non-Keyed Window Operator
                 Key: FLINK-3614
                 URL: https://issues.apache.org/jira/browse/FLINK-3614
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek


I propose to remove the special Non-Keyed Window Operator and implement non-parallel windows by using the standard WindowOperator with a dummy KeySelector.

Maintaining everything for two WindowOperators is a huge burden. The implementation is completely separate by now. For example, the Non-Keyed window operator does not use the StateBackend for state, i.e. cannot use RocksDB. Also, with upcoming changes (Merging/Session windows, aligned windows) this will only increase the maintenance burden.

Also, the fast AlignedProcessingTimeWindows operators also only support the Parallel/Keyed case.



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