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https://issues.apache.org/jira/browse/HDFS-4786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646962#comment-13646962
]
Kihwal Lee commented on HDFS-4786:
----------------------------------
Here is relevant stack trace:
{panel}
"Thread-2" prio=10 tid=0x0000000014159800 nid=0x5724 waiting for monitor entry
[0x00000000421a7000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.hadoop.fs.DelegationTokenRenewer.removeRenewAction(DelegationTokenRenewer.java:191)
- waiting to lock <0x00000000ffab04b0> (a
org.apache.hadoop.fs.DelegationTokenRenewer)
at
org.apache.hadoop.hdfs.web.WebHdfsFileSystem.close(WebHdfsFileSystem.java:825)
at org.apache.hadoop.fs.FileSystem$Cache.closeAll(FileSystem.java:2402)
- locked <0x00000000ffac8210> (a org.apache.hadoop.fs.FileSystem$Cache)
at
org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer.run(FileSystem.java:2419)
- locked <0x00000000ffac8200> (a
org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer)
at
org.apache.hadoop.util.ShutdownHookManager$1.run(ShutdownHookManager.java:54)
"FileSystem-DelegationTokenRenewer" daemon prio=10 tid=0x0000000013f9b800
nid=0x5723 waiting on condition [0x00000000420a6000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000ffab0530> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)
at java.util.concurrent.DelayQueue.take(DelayQueue.java:220)
at
org.apache.hadoop.fs.DelegationTokenRenewer.run(DelegationTokenRenewer.java:215)
- locked <0x00000000ffab04b0> (a
org.apache.hadoop.fs.DelegationTokenRenewer)
{panel}
> 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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