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

["Gyula Fora (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15195046#comment-15195046 ] 

Gyula Fora commented on FLINK-3614:
-----------------------------------

I think this is a very good idea, and also this is probably the right time to add parallel pre-aggregation for global window reduces.

> 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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