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https://issues.apache.org/jira/browse/YARN-5846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15650458#comment-15650458
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zhangyubiao commented on YARN-5846:
-----------------------------------
:)
> Improve the fairscheduler attemptScheduler
> -------------------------------------------
>
> Key: YARN-5846
> URL: https://issues.apache.org/jira/browse/YARN-5846
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Affects Versions: 2.7.1
> Environment: CentOS-7.1
> Reporter: zhengchenyu
> Priority: Critical
> Labels: fairscheduler
> Fix For: 2.7.1
>
> Original Estimate: 1m
> Remaining Estimate: 1m
>
> when I assign a container, we must consider two factor:
> (1) sort the queue and application, and select the proper request.
> (2) then we assure this request's host is just this node (data locality).
> or skip this loop!
> this algorithm regard the sorting queue and application as primary factor.
> when yarn consider data locality, for example,
> yarn.scheduler.fair.locality.threshold.node=1,
> yarn.scheduler.fair.locality.threshold.rack=1 (or
> yarn.scheduler.fair.locality-delay-rack-ms and
> yarn.scheduler.fair.locality-delay-node-ms is very large) and lots of
> applications are runnig, the process of assigning contianer becomes very slow.
> I think data locality is more important then the sequence of the queue and
> applications.
> I wanna a new algorithm like this:
> (1) when resourcemanager accept a new request, notice the RMNodeImpl,
> and then record this association between RMNode and request
> (2) when assign containers for node, we assign container by
> RMNodeImpl's association between RMNode and request directly
> (3) then I consider the priority of queue and applation. In one object
> of RMNodeImpl, we sort the request of association.
> (4) and I think the sorting of current algorithm is consuming, in
> especial, losts of applications are running, lots of sorting are called. so I
> think we should sort the queue and applicaiton in a daemon thread, because
> less error of queues's sequences is allowed.
>
>
>
>
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