[jira] [Created] (YARN-7600) Yarn NODE_LOCAL request downgraded to RACK_LOCAL didn't cancel the original NODE_LOCAL request

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

wuchang created YARN-7600:
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             Summary: Yarn NODE_LOCAL request downgraded to RACK_LOCAL  didn't cancel the original NODE_LOCAL request
                 Key: YARN-7600
                 URL: https://issues.apache.org/jira/browse/YARN-7600
             Project: Hadoop YARN
          Issue Type: Task
    Affects Versions: 2.7.3
            Reporter: wuchang


I know, when AM making container request, if the request container is NODE_LOCAL, then AM will also send out RACK_LOCAL and OFF_SWITCH requests. On the ResourceManager side, if RM successfully assigned a NODE_LOCAL container, I saw that RM canceled RACK_LOCAL and OFF_SWITCH requests because it was a duplicated request and did not need to be allocated any more. 
However, my problem is that if {code}allow_relaxity = true{code} for RACK_LOCAL and OFF_SWITCH,   NODE_LOCAL request is downgraded to RACK_LOCAL and the allocation is successful, ie, NODE_LOCAL's request is allocated with RACK_LOCAL locality, then OFF_SWITCH's duplicated request will be canceled, however I did not see RM cancel the NODE_LOCAL request, so, won't it lead to NODE_LOCAL request still exist and then be scheduled in the next-round scheduling?



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