[jira] [Commented] (SPARK-10901) spark.yarn.user.classpath.first doesn't work

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940092#comment-14940092 ] 

Marcelo Vanzin commented on SPARK-10901:
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As a potential workaround, he can add his app jar (or the kryo jar) to {{spark.{executor,driver}.extraClassPath}}. If he distributes the jars with the application (using {{--jars}} in cluster mode or {{spark.yarn.dist.files}} in client mode), just add the jar names without any path and they should be prepended to the app's classpath.

> spark.yarn.user.classpath.first doesn't work
> --------------------------------------------
>
>                 Key: SPARK-10901
>                 URL: https://issues.apache.org/jira/browse/SPARK-10901
>             Project: Spark
>          Issue Type: Bug
>          Components: YARN
>    Affects Versions: 1.5.1
>            Reporter: Thomas Graves
>            Assignee: Thomas Graves
>            Priority: Critical
>
> spark.yarn.user.classpath.first doesn't properly add the app jar to the system class path first.  It has some logic there that i believe works for local files but running on yarn using distributed cache to distribute the app jar doesn't put __app__.jar into the classpath at all.
> This is a break in backwards compatibility.
> Note that in this case the user is trying to use different version of kryo (which used to work in spark 1.2) and the new configs for this: spark.{driver, executor}.userClassPathFirst don't allow this as it errors out with:
> User class threw exception: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/spark/util/ChildFirstURLClassLoader) previously initiated loading for a different type with name "com/esotericsoftware/kryo/Kryo"



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