[jira] [Created] (YARN-6042) Fairscheduler: Dump scheduler state in log

["Yufei Gu (JIRA)" <ji...@apache.org>]

Yufei Gu created YARN-6042:
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             Summary: Fairscheduler: Dump scheduler state in 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


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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