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Posted to issues@flink.apache.org by "vinoyang (JIRA)" <ji...@apache.org> on 2019/07/08 06:52:00 UTC

[jira] [Assigned] (FLINK-3480) Add hash-based strategy for ReduceFunction

     [ https://issues.apache.org/jira/browse/FLINK-3480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

vinoyang reassigned FLINK-3480:
-------------------------------

    Assignee:     (was: vinoyang)

> Add hash-based strategy for ReduceFunction
> ------------------------------------------
>
>                 Key: FLINK-3480
>                 URL: https://issues.apache.org/jira/browse/FLINK-3480
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Task
>            Reporter: Fabian Hueske
>            Priority: Major
>
> This issue is related to FLINK-3477. 
> While FLINK-3477 proposes to add hash-based combine strategy for ReduceFunction, this issue aims to add a hash-based strategy for the final aggregation.
> This will need again a special hash-table aggregation which allows for in-place updates and append updates. However, it also needs to support spilling to disk in case of too tight memory budgets.



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