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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-4212) FairScheduler: Parent queues with 'Fair' policy should compute shares of all resources for its children during a recompute
Date Wed, 30 Sep 2015 08:13:04 GMT
Arun Suresh created YARN-4212:
---------------------------------

             Summary: FairScheduler: Parent queues with 'Fair' policy should compute shares
of all resources for its children during a recompute
                 Key: YARN-4212
                 URL: https://issues.apache.org/jira/browse/YARN-4212
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Arun Suresh
            Assignee: Arun Suresh


The Fair Scheduler, while performing a {{recomputeShares()}} during an {{update()}} call,
uses the parent queues policy to distribute shares to its children.

If the parent queues policy is 'fair', it only computes weight for memory and sets the vcores
fair share of its children to 0.

Assuming a situation where we have 1 parent queue with policy 'fair' and multiple leaf queues
with policy 'drf', Any app submitted to the child queues with vcore requirement > 1 will
always be above fairshare, since during the recomputeShare process, the child queues were
all assigned 0 for fairshare vcores.




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