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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6177) Yarn client should exit with an informative error message if an incompatible Jersey library is used at client
Date Thu, 16 Feb 2017 14:58:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870096#comment-15870096

Jason Lowe commented on YARN-6177:

The best effort setting was primarily targeting the scenario where the timeline server is
down and not wanting jobs to fail as a result.  It wasn't intended to mask jar conflicts like

Maybe I'm misunderstanding option #1 from above, but we should not be changing the best-effort
default value.  That's an incompatible and surprising change.  

When someone sets best-effort to true then they desire the timeline server to work but don't
want transient errors to block the job's progress.  This case is not a transient error --
the timeline client is never going to work with that jar conflict in place.  Therefore I agree
with [~gtCarrera9] that we should not mask this error.  If it's common then I think we should
check for it and provide a useful error message stating the user needs to address the classpath
conflict or disable the timeline client, but the error should still be fatal.

> Yarn client should exit with an informative error message if an incompatible Jersey library
is used at client
> -------------------------------------------------------------------------------------------------------------
>                 Key: YARN-6177
>                 URL: https://issues.apache.org/jira/browse/YARN-6177
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.8.0, 3.0.0-alpha2
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>         Attachments: spark2-job-output-after-besteffort.out, spark2-job-output-after.out,
spark2-job-output-before.out, YARN-6177.01.patch, YARN-6177.02.patch, YARN-6177.03.patch,
YARN-6177.04.patch, YARN-6177.05.patch
> Per discussion in YARN-5271, lets provide an error message to suggest user to disable
timeline service instead of disabling for them.

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