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https://issues.apache.org/jira/browse/HDFS-7253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14172299#comment-14172299
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Carrey Zhan commented on HDFS-7253:
-----------------------------------
thanks [~hitliuyi]
> getBlockLocationsUpdateTimes missing handle exception may cause fsLock dead
> lock
> --------------------------------------------------------------------------------
>
> Key: HDFS-7253
> URL: https://issues.apache.org/jira/browse/HDFS-7253
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.2.0
> Reporter: Carrey Zhan
> Attachments: Tester.java, Trigger.tgz, nn1013.jstack
>
>
> One day my active namenode hanged and I dumped the program stacks by
> jstack.In the stacks file, I saw most threads were waiting
> FSNamesystem.fsLock, both readLock and writeLock were unacquirable, but no
> thread was holding writeLock.
> I tried to access the web interface of this namenode but was blocked. and I
> tried to failover the active node to another namenode manually (zkfs did not
> discover this node was hanging) but it was also failed. So I killed this
> namenode trying to recover the production environment, then the failover was
> triggered, standby nn transited to active, and then, the new active namenode
> hanged.
> My following steps are useless and can be ignored. At last, I thought it was
> caused by an incorrect lock handling in
> FSNamesystem.getBlockLocationsUpdateTimes, which I will describe in the first
> comment.
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