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https://issues.apache.org/jira/browse/HDFS-12339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16147443#comment-16147443
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Ruslan Dautkhanov commented on HDFS-12339:
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We think this might be the root cause for nfs clients hanging issue we see
sometimes when gdfs nfs gateway stops.
Timeouts don't work as an nfs client can see rpc service for nfs is up, but
there is no actual live service behind that rpc service..
kinda zombie rpc service if it makes sense to you. Although we are not entirely
certain if that's the root cause.
Would be great to have this fixed anyway.
> NFS Gateway on Shutdown Gives Unregistration Failure. Does Not Unregister
> with rpcbind Portmapper
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-12339
> URL: https://issues.apache.org/jira/browse/HDFS-12339
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Sailesh Patel
> Assignee: Mukul Kumar Singh
>
> When stopping NFS Gateway the following error is thrown in the NFS gateway
> role logs.
> 2017-08-17 18:09:16,529 ERROR org.apache.hadoop.oncrpc.RpcProgram:
> Unregistration failure with localhost:2049, portmap entry:
> (PortmapMapping-100003:3:6:2049)
> 2017-08-17 18:09:16,531 WARN org.apache.hadoop.util.ShutdownHookManager:
> ShutdownHook 'NfsShutdownHook' failed, java.lang.RuntimeException:
> Unregistration failure
> java.lang.RuntimeException: Unregistration failure
> ..
> Caused by: java.net.SocketException: Socket is closed
> at java.net.DatagramSocket.send(DatagramSocket.java:641)
> at org.apache.hadoop.oncrpc.SimpleUdpClient.run(SimpleUdpClient.java:62)
> Checking rpcinfo -p : the following entry is still there:
> " 100003 3 tcp 2049 nfs"
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