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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-12807) Spark External Shuffle not working in Hadoop clusters with Jackson 2.2.3
Date Fri, 05 Feb 2016 16:29:39 GMT

    [ https://issues.apache.org/jira/browse/SPARK-12807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15134414#comment-15134414
] 

Steve Loughran commented on SPARK-12807:
----------------------------------------

mixing dependency versions in a single project is dangerous. And it still runs the risk of
being brittle against whatever version of jackson Hadoop namenodes run with. While I'm not
a fan of shading, until we get better classpath/process isolation in nodemanagers, shading
here avoids problems and will ensure that ASF spark releases work with ASF Hadoop releases.

> Spark External Shuffle not working in Hadoop clusters with Jackson 2.2.3
> ------------------------------------------------------------------------
>
>                 Key: SPARK-12807
>                 URL: https://issues.apache.org/jira/browse/SPARK-12807
>             Project: Spark
>          Issue Type: Bug
>          Components: Shuffle, YARN
>    Affects Versions: 1.6.0
>         Environment: A Hadoop cluster with Jackson 2.2.3, spark running with dynamic
allocation enabled
>            Reporter: Steve Loughran
>            Priority: Critical
>
> When you try to try to use dynamic allocation on a Hadoop 2.6-based cluster, you get
to see a stack trace in the NM logs, indicating a jackson 2.x version mismatch.
> (reported on the spark dev list)



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