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

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

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

Aljoscha Krettek closed FLINK-3480.
-----------------------------------
    Resolution: Won't Do

I'm closing this for now because the DataSet API is more in maintenance mode and we don't actively work on new features there.

> 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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