Sunil G created YARN-4091:
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Summary: Improvement: Introduce more debug/diagnostics information
to detail out scheduler activity
Key: YARN-4091
URL: https://issues.apache.org/jira/browse/YARN-4091
Project: Hadoop YARN
Issue Type: Improvement
Components: capacity scheduler, resourcemanager
Affects Versions: 2.7.0
Reporter: Sunil G
Assignee: Sunil G
As schedulers are improved with various new capabilities, more configurations
which tunes the schedulers starts to take actions such as limit assigning
containers to an application, or introduce delay to allocate container etc.
There are no clear information passed down from scheduler to outerworld under
these various scenarios. This makes debugging very tougher.
This ticket is an effort to introduce more defined states on various parts in
scheduler where it skips/rejects container assignment, activate application
etc. Such information will help user to know whats happening in scheduler.
Attaching a short proposal for initial discussion. We would like to improve on
this as we discuss.
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