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https://issues.apache.org/jira/browse/YARN-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15881636#comment-15881636
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Ray Chiang commented on YARN-6042:
----------------------------------
Very minor nit:
The result of this part of code:
{quote}
rootMetrics.getAvailableMB(), rootMetrics.getAvailableVirtualCores()) +
rootQueue.dumpState());
{quote}
There is no separation between the scheduler and the queue states. From my
sample output, the part in red looks a little odd:
{quote}
2017-02-23 14:53:29,644 DEBUG fair.FairScheduler: FairScheduler state: Cluster
Capacity: <memory:0, vCores:0> Allocations: <memory:0, vCores:0>
Availability: <memory:0, vCores:0{color:red}>{{color}Name: root, Weight:
<memory weight=1.0, cpu weight=1.0>, Policy: fair, FairShare: <memory:0,
vCores:0>, SteadyFairShare: <memory:0, vCores:0>,
{quote}
I'd suggest adding two spaces and possibly a label like the rest of the
scheduler state?
> Dump scheduler and queue state information into FairScheduler DEBUG log
> -----------------------------------------------------------------------
>
> Key: YARN-6042
> URL: https://issues.apache.org/jira/browse/YARN-6042
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Reporter: Yufei Gu
> Assignee: Yufei Gu
> Attachments: YARN-6042.001.patch, YARN-6042.002.patch,
> YARN-6042.003.patch, YARN-6042.004.patch, YARN-6042.005.patch,
> YARN-6042.006.patch, YARN-6042.007.patch
>
>
> To improve the debugging of scheduler issues it would be a big improvement to
> be able to dump the scheduler state into a log on request.
> The Dump the scheduler state at a point in time would allow debugging of a
> scheduler that is not hung (deadlocked) but also not assigning containers.
> Currently we do not have a proper overview of what state the scheduler and
> the queues are in and we have to make assumptions or guess
> The scheduler and queue state needed would include (not exhaustive):
> - instantaneous and steady fair share (app / queue)
> - AM share and resources
> - weight
> - app demand
> - application run state (runnable/non runnable)
> - last time at fair/min share
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