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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7790) Improve Capacity Scheduler Async Scheduling to better handle node failures
Date Tue, 23 Jan 2018 07:14:00 GMT
Wangda Tan created YARN-7790:
--------------------------------

             Summary: Improve Capacity Scheduler Async Scheduling to better handle node failures
                 Key: YARN-7790
                 URL: https://issues.apache.org/jira/browse/YARN-7790
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Wangda Tan
            Assignee: Wangda Tan


This is not a new issue but async scheduling makes it worse:

In sync scheduling, if an AM container allocated to a node, it assumes node just heartbeat
to RM, and in the same response, it will be sent back to NM. Even though it is possible that
NM crashes after the heartbeat, which causes AM hangs for 10 mins. But it is related rare.

In async scheduling world, multiple AM containers can be placed on a problematic NM, which
could cause application hangs for long time. Discussed with [~sunilg] , we need at least two
fixes:

When async scheduling enabled:
1) Skip node which missed X node heartbeat.
2) Kill AM container in ALLOCATED state on a node which missed Y node heartbeat.



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