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https://issues.apache.org/jira/browse/YARN-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15150557#comment-15150557
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Steve Loughran commented on YARN-4696:
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It is for testing: the previous ATS ran happily standalone, wheres v 1.5 hangs
looking for an RM at 0.0.0.0. Some form of mock RM could do it, but
# line 46; I was thinking about moving all the YarnConfiguration imports to
static ones ... there were a lot of them. But if not, then not.
# I'll look at findbugs
Mocking is a thought; it might be easiest to isolate the construction/use of
the yarn client so it's straightforward to mock/subclass
> 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
> Attachments: YARN-4696-001.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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