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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 Tue, 07 Nov 2017 14:10:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16242058#comment-16242058
] 

ASF GitHub Bot commented on FLINK-7870:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/4887


> 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
>              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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