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https://issues.apache.org/jira/browse/HDFS-5804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13880577#comment-13880577
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Abin Shahab commented on HDFS-5804:
-----------------------------------

BTW, I have a patch that gets rid off even checking whether we are in secure 
mode, but I'm not sure if it's the right thing to submit that patch. That patch 
would require the nfs-gateway user(nfsserver in our case) be allowed to proxy 
root, even in non-secure mode. That's a big change.

> HDFS NFS Gateway fails to mount and proxy when using Kerberos
> -------------------------------------------------------------
>
>                 Key: HDFS-5804
>                 URL: https://issues.apache.org/jira/browse/HDFS-5804
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: nfs
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Abin Shahab
>         Attachments: HDFS-5804.patch, HDFS-5804.patch, exception-as-root.log, 
> javadoc-after-patch.log, javadoc-before-patch.log
>
>
> When using HDFS nfs gateway with secure hadoop 
> (hadoop.security.authentication: kerberos), mounting hdfs fails. 
> Additionally, there is no mechanism to support proxy user(nfs needs to proxy 
> as the user invoking commands on the hdfs mount).
> Steps to reproduce:
> 1) start a hadoop cluster with kerberos enabled.
> 2) sudo su -l nfsserver and start an nfs server. This 'nfsserver' account has 
> a an account in kerberos.
> 3) Get the keytab for nfsserver, and issue the following mount command: mount 
> -t nfs -o vers=3,proto=tcp,nolock $server:/  $mount_point
> 4) You'll see in the nfsserver logs that Kerberos is complaining about not 
> having a TGT for root.
> This is the stacktrace: 
> java.io.IOException: Failed on local exception: java.io.IOException: 
> org.apache.hadoop.security.AccessControlException: Client cannot authenticate 
> via:[TOKEN, KERBEROS]; Host Details : local host is: 
> "my-nfs-server-host.com/10.252.4.197"; destination host is: 
> "my-namenode-host.com":8020; 
>       at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:764)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1351)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1300)
>       at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
>       at com.sun.proxy.$Proxy9.getFileLinkInfo(Unknown Source)
>       at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
>       at 
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
>       at com.sun.proxy.$Proxy9.getFileLinkInfo(Unknown Source)
>       at 
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileLinkInfo(ClientNamenodeProtocolTranslatorPB.java:664)
>       at org.apache.hadoop.hdfs.DFSClient.getFileLinkInfo(DFSClient.java:1713)
>       at 
> org.apache.hadoop.hdfs.nfs.nfs3.Nfs3Utils.getFileStatus(Nfs3Utils.java:58)
>       at 
> org.apache.hadoop.hdfs.nfs.nfs3.Nfs3Utils.getFileAttr(Nfs3Utils.java:79)
>       at 
> org.apache.hadoop.hdfs.nfs.nfs3.RpcProgramNfs3.fsinfo(RpcProgramNfs3.java:1643)
>       at 
> org.apache.hadoop.hdfs.nfs.nfs3.RpcProgramNfs3.handleInternal(RpcProgramNfs3.java:1891)
>       at 
> org.apache.hadoop.oncrpc.RpcProgram.messageReceived(RpcProgram.java:143)
>       at 
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>       at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>       at 
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
>       at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:281)
>       at 
> org.apache.hadoop.oncrpc.RpcUtil$RpcMessageParserStage.messageReceived(RpcUtil.java:132)
>       at 
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>       at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>       at 
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
>       at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
>       at 
> org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
>       at 
> org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
>       at 
> org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
>       at 
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>       at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>       at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:555)
>       at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
>       at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
>       at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
>       at 
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:107)
>       at 
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
>       at 
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
>       at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
>       at 
> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
>       at 
> org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>       at java.lang.Thread.run(Thread.java:744)
> Caused by: java.io.IOException: 
> org.apache.hadoop.security.AccessControlException: Client cannot authenticate 
> via:[TOKEN, KERBEROS]
>       at org.apache.hadoop.ipc.Client$Connection$1.run(Client.java:620)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
>       at 
> org.apache.hadoop.ipc.Client$Connection.handleSaslConnectionFailure(Client.java:583)
>       at 
> org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:667)
>       at org.apache.hadoop.ipc.Client$Connection.access$2600(Client.java:314)
>       at org.apache.hadoop.ipc.Client.getConnection(Client.java:1399)
>       at org.apache.hadoop.ipc.Client.call(Client.java:1318)
>       ... 43 more
> Caused by: org.apache.hadoop.security.AccessControlException: Client cannot 
> authenticate via:[TOKEN, KERBEROS]
>       at 
> org.apache.hadoop.security.SaslRpcClient.selectSaslClient(SaslRpcClient.java:170)
>       at 
> org.apache.hadoop.security.SaslRpcClient.saslConnect(SaslRpcClient.java:387)
>       at 
> org.apache.hadoop.ipc.Client$Connection.setupSaslConnection(Client.java:494)
>       at org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:314)
>       at org.apache.hadoop.ipc.Client$Connection$2.run(Client.java:659)
>       at org.apache.hadoop.ipc.Client$Connection$2.run(Client.java:655)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
>       at 
> org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:654)



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