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