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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7870) SlotPool should cancel the slot request to RM if not need any more.
Date Fri, 03 Nov 2017 06:34:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237162#comment-16237162

ASF GitHub Bot commented on FLINK-7870:

Github user shuai-xu commented on a diff in the pull request:

    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/ResourceActions.java
    @@ -52,4 +52,6 @@
     	 * @param cause of the allocation failure
     	void notifyAllocationFailure(JobID jobId, AllocationID allocationId, Exception cause);
    +	void cancelResourceAllocation(ResourceProfile resourceProfile);
    --- End diff --
    I comment it is slot manager.

> SlotPool should cancel the slot request to RM if not need any more.
> -------------------------------------------------------------------
>                 Key: FLINK-7870
>                 URL: https://issues.apache.org/jira/browse/FLINK-7870
>             Project: Flink
>          Issue Type: Bug
>          Components: Cluster Management
>            Reporter: shuai.xu
>            Assignee: shuai.xu
>            Priority: Major
>              Labels: flip-6
> 1. SlotPool will request slot to rm if its slots are not enough.
> 2. If a slot request is not fulfilled in a certain time, SlotPool will treat the request
as timeout and send a new slot request by triggering a failover in JobMaster, the previous
request is not needed any more, but rm does not know it.
> 3. This may cause the rm request much more resource than the job really need.
> For example:
> 1. A job need 100 slots. RM request 100 container to YARN.
> 2. But YARN is busy now, it has no resource for the job.
> 3. The job failover as the resource request not fulfilled in time.
> 4. It ask 100 slots again, now RM request 200 container to YARN.
> 5. If failover server time, the containers request  will become more and more.
> 6. Now YARN has resource, it will find that the job may need thousands of containers.
This is a waste of resources.

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