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https://issues.apache.org/jira/browse/YARN-6920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113973#comment-16113973
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Arun Suresh commented on YARN-6920:
-----------------------------------
bq. ..it is possible that a different container gets started later on
SCHEDULE_CONTAINER event ?
It is possible, but given the following invariant:
# *Total Resources of Guaranteed containers ALLOCATED on a Node cannot exceed
the Node capacity*: The RM ensures that Guaranteed container are never
over-allocated on an NM
# *Total (Opportunistic + Guaranteed) resources of RUNNING containers cannot
exceed Node capacity*: The ContainerSchedulerenforces this.
# *Running Opportunistic containers will be preempted to make room for
Guaranteed containers*: Also enforced by the ContainerScheduler
We don't really have to worry about if a different container starts in the
meanwhile. If the new container that was started is a Guaranteed, then the Node
should have the resources to begin with.. and if Opportunistic, then, it will
probably be killed when our ReInitializing container is restarted.
bq. And for service container, user should be expected to always use
Guaranteed type.
Yup. There is already an {{enforceExecutionType}} field in the
ResourceRequest::ExecutionTypeRequest that an AM can use to ensure that
container it receives against this request is of Guaranteed type.
> Fix TestNMClient failure due to YARN-6706
> -----------------------------------------
>
> Key: YARN-6920
> URL: https://issues.apache.org/jira/browse/YARN-6920
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Arun Suresh
> Assignee: Arun Suresh
> Attachments: YARN-6920.001.patch, YARN-6920.002.patch,
> YARN-6920.003.patch, YARN-6920.004.patch
>
>
> Looks like {{TestNMClient}} has been failing for a while. Opening this JIRA
> to track the fix.
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