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Posted to issues@spark.apache.org by "Thomas Graves (JIRA)" <ji...@apache.org> on 2017/07/19 21:01:00 UTC

[jira] [Resolved] (SPARK-21243) Limit the number of maps in a single shuffle fetch

     [ https://issues.apache.org/jira/browse/SPARK-21243?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Graves resolved SPARK-21243.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

> Limit the number of maps in a single shuffle fetch
> --------------------------------------------------
>
>                 Key: SPARK-21243
>                 URL: https://issues.apache.org/jira/browse/SPARK-21243
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.1.0, 2.1.1
>            Reporter: Dhruve Ashar
>            Assignee: Dhruve Ashar
>            Priority: Minor
>             Fix For: 2.3.0
>
>
> Right now spark can limit the # of parallel fetches and also limits the amount of data in one fetch, but one fetch to a host could be for 100's of blocks. In one instance we saw 450+ blocks. When you have 100's of those and 1000's of reducers fetching that becomes a lot of metadata and can run the Node Manager out of memory. We should add a config to limit the # of maps per fetch to reduce the load on the NM.



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