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https://issues.apache.org/jira/browse/MAPREDUCE-4309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413546#comment-13413546
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Junping Du commented on MAPREDUCE-4309:
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Bikas, thanks for your comments. Please see my reply:
1). That's a good point. I have this code before decrementOutstanding() is
there. I will fix this in following patch.
2 and 3). subclass is put in as plug-in patch which is tracked by
MAPREDUCE-4310. With seeing that patch as well as the proposal in Umbrella jira
(HADOOP-8468), it will help you understand the work we are doing in this jira.
> Make locatlity in YARN's container assignment and task scheduling pluggable
> for other deployment topology
> ---------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4309
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4309
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments:
> HADOOP-8474-ContainerAssignmentTaskScheduling-pluggable.patch,
> MAPREDUCE-4309-v2.patch, MAPREDUCE-4309-v3.patch, MAPREDUCE-4309-v4.patch,
> MAPREDUCE-4309.patch
>
>
> There are several classes in YARN’s container assignment and task scheduling
> algorithms that relate to data locality which were updated to give preference
> to running a container on other locality besides node-local and rack-local
> (like nodegroup-local). This propose to make these data structure/algorithms
> pluggable, like: SchedulerNode, RMNodeImpl, etc. The inner class
> ScheduledRequests was made a package level class to it would be easier to
> create a subclass, ScheduledRequestsWithNodeGroup.
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