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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