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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-21243) Limit the number of maps in a single shuffle fetch
Date Fri, 30 Jun 2017 13:09:00 GMT

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

Apache Spark reassigned SPARK-21243:
------------------------------------

    Assignee: Apache Spark

> 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: Apache Spark
>            Priority: Minor
>
> 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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