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https://issues.apache.org/jira/browse/YARN-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15152656#comment-15152656
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Steve Loughran commented on YARN-4696:
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Patch -003. Adds more robustness/diagnostics to the plugin load process
# the list of classes are trimmed, so things like spaces and newlines don't
break the loader
# any exception raised when plugin creation fails is included in the rethrown
exception
> EntityGroupFSTimelineStore to work in the absence of an RM
> ----------------------------------------------------------
>
> Key: YARN-4696
> URL: https://issues.apache.org/jira/browse/YARN-4696
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: YARN-4696-001.patch, YARN-4696-002.patch,
> YARN-4696-003.patch
>
>
> {{EntityGroupFSTimelineStore}} now depends on an RM being up and running; the
> configuration pointing to it. This is a new change, and impacts testing where
> you have historically been able to test without an RM running.
> The sole purpose of the probe is to automatically determine if an app is
> running; it falls back to "unknown" if not. If the RM connection was
> optional, the "unknown" codepath could be called directly, relying on age of
> file as a metric of completion
> Options
> # add a flag to disable RM connect
> # skip automatically if RM not defined/set to 0.0.0.0
> # disable retries on yarn client IPC; if it fails, tag app as unknown.
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