[jira] [Closed] (FLINK-2674) Rework windowing logic

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen closed FLINK-2674.
-------------------------------

> Rework windowing logic
> ----------------------
>
>                 Key: FLINK-2674
>                 URL: https://issues.apache.org/jira/browse/FLINK-2674
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 0.10.0
>            Reporter: Stephan Ewen
>            Priority: Critical
>             Fix For: 1.0.0
>
>
> The windowing logic needs a major overhaul. This follows the design documents: 
>   - https://cwiki.apache.org/confluence/display/FLINK/Time+and+Order+in+Streams
>   - https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=60624830
> Specifically, the following shortcomings need to be addressed:
>   - Global parallel windows should be dropped
>        -> for time, local windows are aligned and serve the same purpose
>        -> there is currently no known robust and efficient parallel implementation of custom strategies 
>   - Event time and out of order arrival needs to be supported
>   - Eviction of not accessed keys does not work. Non-accessed keys linger infinitely
>   - Performance is currently bad for time windows, due to a overly general implementation
>   - Resources are leaking, threads are not shut down
>   - Elements are stored multiple times (discretizers, window buffers)
>   - Finally, many implementations are buggy, produce wrong results



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