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https://issues.apache.org/jira/browse/HDFS-4786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647529#comment-13647529
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Kihwal Lee commented on HDFS-4786:
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The synchronize around queue.take() was added by HADOOP-9049.
> WebHdfsFileSystem hangs on close()
> ----------------------------------
>
> Key: HDFS-4786
> URL: https://issues.apache.org/jira/browse/HDFS-4786
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Affects Versions: 2.0.4-alpha
> Reporter: Kihwal Lee
>
> When close() is called via fs shoutdown hook, the synchronized method,
> removeRenewAction() hangs. This is because DelegationTokenRenewer calls
> DelayQueue.take() inside a synchronized block. Since this is a blocking call,
> it hangs forever.
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