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https://issues.apache.org/jira/browse/HDFS-4840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664480#comment-13664480
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Jing Zhao commented on HDFS-4840:
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We're trying to fix this in HDFS-4813, but seems that fix did not work. At the
time of HDFS-4813, according to the log at that time, we thought the NPE was
not thrown during shutdown. Instead, the NPE caused the shutdown of
MiniDFSCluster, because the whole testing had not finished at the time of
exception. I will check the log of the most recent failure and try to figure
out the cause of the NPE.
> ReplicationMonitor and FSEditLogLoader get NPE during shutdown
> --------------------------------------------------------------
>
> Key: HDFS-4840
> URL: https://issues.apache.org/jira/browse/HDFS-4840
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Kihwal Lee
>
> TestBlocksWithNotEnoughRacks occasionally fails during test tear down because
> RaplicationMonitor gets NPE.
> Seen at https://builds.apache.org/job/Hadoop-Hdfs-trunk/1406/.
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