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https://issues.apache.org/jira/browse/YARN-779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677644#comment-13677644
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Alejandro Abdelnur commented on YARN-779:
-----------------------------------------
It may be that if a ContainerRequest has been partially allocated and it is
remove the count goes also out of synch.
> AMRMClient should clean up dangling unsatisfied request
> -------------------------------------------------------
>
> Key: YARN-779
> URL: https://issues.apache.org/jira/browse/YARN-779
> Project: Hadoop YARN
> Issue Type: Bug
> Components: client
> Affects Versions: 2.0.4-alpha
> Reporter: Alejandro Abdelnur
> Priority: Critical
>
> If an AMRMClient allocates a ContainerRequest for 10 containers in node1 or
> node2 is placed (assuming a single rack) the resulting ResourceRequests will
> be
> {code}
> location - containers
> ---------------------
> node1 - 10
> node2 - 10
> rack - 10
> ANY - 10
> {code}
> Assuming 5 containers are allocated in node1 and 5 containers are allocated
> in node2, the following ResourceRequests will be outstanding.
> {code}
> location - containers
> ---------------------
> node1 - 5
> node2 - 5
> {code}
> If the AMMRClient does a new ContainerRequest allocation, this time for 5
> container in node3, the resulting outstanding ResourceRequests will be:
> {code}
> location - containers
> ---------------------
> node1 - 5
> node2 - 5
> node3 - 5
> rack - 5
> ANY - 5
> {code}
> At this point, the scheduler may assign 5 containers to node1 and it will
> never assign the 5 containers node3 asked for.
> AMRMClient should keep track of the outstanding allocations counts per
> ContainerRequest and when gets to zero it should update the the RACK/ANY
> decrementing the dangling requests.
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