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https://issues.apache.org/jira/browse/SPARK-10901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940092#comment-14940092
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Marcelo Vanzin edited comment on SPARK-10901 at 10/1/15 7:39 PM:
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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.
was (Author: vanzin):
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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