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https://issues.apache.org/jira/browse/YARN-11732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved YARN-11732.
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Fix Version/s: 3.5.0
Hadoop Flags: Reviewed
Resolution: Fixed
> Potential NPE when calling SchedulerNode#reservedContainer for
> CapacityScheduler
> --------------------------------------------------------------------------------
>
> Key: YARN-11732
> URL: https://issues.apache.org/jira/browse/YARN-11732
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 3.4.0, 3.2.4, 3.3.6, 3.5.0
> Reporter: Tao Yang
> Assignee: Tao Yang
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.0
>
>
> I found some places calling *SchedulerNode#getReservedContainer* to get
> reservedContainer (returned value) but not do sanity(not-null) check before
> calling internal methods of it, which can have a risk to raise
> NullPointerException if it's null.
> Most of these places have a premise that node has reserved container a few
> moments ago, but may getting null by calling
> *SchedulerNode#getReservedContainer* in the next moment, since the
> reservedContainer can be updated to null concurrently in scheduling and
> monitoring(preemption) thread. So that not-null check should be done before
> calling internal methods of the reservedContainer.
>
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