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https://issues.apache.org/jira/browse/SPARK-10987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947743#comment-14947743
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Marcelo Vanzin commented on SPARK-10987:
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The {{ExecutorRunnable}} process (client-mode AM) was also running at the time,
although I didn't notice anything interesting in the stack trace.
> yarn-cluster mode misbehaving with netty-based RPC backend
> ----------------------------------------------------------
>
> Key: SPARK-10987
> URL: https://issues.apache.org/jira/browse/SPARK-10987
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, YARN
> Affects Versions: 1.6.0
> Reporter: Marcelo Vanzin
> Priority: Blocker
>
> YARN running in cluster deploy mode seems to be having issues with the new
> RPC backend; if you look at unit test runs, tests that run in cluster mode
> are taking several minutes to run, instead of the more usual 20-30 seconds.
> For example,
> https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/43349/consoleFull:
> {noformat}
> [info] YarnClusterSuite:
> [info] - run Spark in yarn-client mode (13 seconds, 953 milliseconds)
> [info] - run Spark in yarn-cluster mode (6 minutes, 50 seconds)
> [info] - run Spark in yarn-cluster mode unsuccessfully (1 minute, 53 seconds)
> [info] - run Python application in yarn-client mode (21 seconds, 842
> milliseconds)
> [info] - run Python application in yarn-cluster mode (7 minutes, 0 seconds)
> [info] - user class path first in client mode (1 minute, 58 seconds)
> [info] - user class path first in cluster mode (4 minutes, 49 seconds)
> {noformat}
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