[jira] [Updated] (BEAM-11146) Add option to disable copying between Flink runner

["Jan Lukavský (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-11146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jan Lukavský updated BEAM-11146:
--------------------------------
    Status: Open  (was: Triage Needed)

> Add option to disable copying between Flink runner 
> ---------------------------------------------------
>
>                 Key: BEAM-11146
>                 URL: https://issues.apache.org/jira/browse/BEAM-11146
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-flink
>            Reporter: Teodor Spæren
>            Assignee: Teodor Spæren
>            Priority: P2
>              Labels: performance
>
> In order to implement Flink [TypeSerializer|https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/api/common/typeutils/TypeSerializer.java] the runner implements [CoderTypeSerializer|https://github.com/apache/beam/blob/master/runners/flink/1.8/src/main/java/org/apache/beam/runners/flink/translation/types/CoderTypeSerializer.java#L84]. The way the {{copy}} function is implemented is by first serializing and then deserializing each element. This means that such a deep copy needs to be done between each operator and this can become a bottleneck.
> The reason the {{copy}} functions need to be implemented is that Flink guarantees that elements will be deep copied between each operator. In Beam this is the users responsibility and so this is not strictly neccecarry.
> The aim of this improvement is to introduce an option on the Flink Runner, that eliminates this overhead, by simply returning the value.
> [Here is the mailing list discussion|https://lists.apache.org/thread.html/r24129dba98782e1cf4d18ec738ab9714dceb05ac23f13adfac5baad1%40%3Cdev.beam.apache.org%3E]



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