spark-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Apache Spark (JIRA)" <>
Subject [jira] [Assigned] (SPARK-21243) Limit the number of maps in a single shuffle fetch
Date Fri, 30 Jun 2017 13:09:00 GMT


Apache Spark reassigned SPARK-21243:

    Assignee: Apache Spark

> Limit the number of maps in a single shuffle fetch
> --------------------------------------------------
>                 Key: SPARK-21243
>                 URL:
>             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.

This message was sent by Atlassian JIRA

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message