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https://issues.apache.org/jira/browse/HDFS-12415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167390#comment-16167390
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Weiwei Yang commented on HDFS-12415:
------------------------------------
I think the problem was from this line
{code}
public SCMNodeMetric getNodeStat(DatanodeID datanodeID) {
return new SCMNodeMetric(nodeStats.get(datanodeID.getDatanodeUuid()));
}
{code}
Somehow {{datanodeID}} was null, the patch ensures {{SCMNodeManager#getNodes}}
won't return any null datanode IDs, which seems to have fixed this issue.
> Ozone: TestXceiverClientManager and TestAllocateContainer occasionally fails
> ----------------------------------------------------------------------------
>
> Key: HDFS-12415
> URL: https://issues.apache.org/jira/browse/HDFS-12415
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: HDFS-7240
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Attachments: HDFS-12415-HDFS-7240.001.patch,
> HDFS-12415-HDFS-7240.002.patch, HDFS-12415-HDFS-7240.003.patch
>
>
> TestXceiverClientManager seems to be occasionally failing in some jenkins
> jobs,
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.hadoop.ozone.scm.node.SCMNodeManager.getNodeStat(SCMNodeManager.java:828)
> at
> org.apache.hadoop.ozone.scm.container.placement.algorithms.SCMCommonPolicy.hasEnoughSpace(SCMCommonPolicy.java:147)
> at
> org.apache.hadoop.ozone.scm.container.placement.algorithms.SCMCommonPolicy.lambda$chooseDatanodes$0(SCMCommonPolicy.java:125)
> {noformat}
> see more from [this
> report|https://builds.apache.org/job/PreCommit-HDFS-Build/21065/testReport/]
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