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https://issues.apache.org/jira/browse/YARN-7903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16356327#comment-16356327
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Steven Rand commented on YARN-7903:
-----------------------------------
Agreed that it seems weird/wrong to ignore locality when considering which of
an app's RRs to preempt for. I think it's worth noting though that if we change
the code to choose the most local request, then we increase the frequency of
the failure mode described in YARN-6956, where we fail to preempt because
{{getStarvedResourceRequests}} returns only {{NODE_LOCAL}} RRs, and there
aren't any preemptable containers on those nodes (even though there are
preemptable containers on other nodes). I think that we should try to make
progress on that JIRA as well as this one.
> Method getStarvedResourceRequests() only consider the first encountered
> resource
> --------------------------------------------------------------------------------
>
> Key: YARN-7903
> URL: https://issues.apache.org/jira/browse/YARN-7903
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 3.1.0
> Reporter: Yufei Gu
> Priority: Major
>
> We need to specify rack and ANY while submitting a node local resource
> request, as YARN-7561 discussed. For example:
> {code}
> ResourceRequest nodeRequest =
> createResourceRequest(GB, node1.getHostName(), 1, 1, false);
> ResourceRequest rackRequest =
> createResourceRequest(GB, node1.getRackName(), 1, 1, false);
> ResourceRequest anyRequest =
> createResourceRequest(GB, ResourceRequest.ANY, 1, 1, false);
> List<ResourceRequest> resourceRequests =
> Arrays.asList(nodeRequest, rackRequest, anyRequest);
> {code}
> However, method getStarvedResourceRequests() only consider the first
> encountered resource, which most likely is ResourceRequest.ANY. That's a
> mismatch for locality request.
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