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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4858) HDFS DataNode to NameNode RPC should timeout
Date Sun, 09 Feb 2014 21:35:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13896058#comment-13896058
] 

Konstantin Shvachko commented on HDFS-4858:
-------------------------------------------

I thought the client timeout problem was solved by HDFS-4646. It's been working fine for us
since then.  Is it a different problem you are talking about?

> see around line 600

Line 600 of what?

> It is also used by the TaskTracker 

Are you referring to cdh4, as trunk and Hadoop 2 don't have TaskTracker.

Sorry, I didn't understand the general problem from your descriptions, guys. If you could
tell how to reproduce it or better propose a fix. The DataNode problem is real though, because
fail-overs fail when the DN thread gets stuck. It would be good to fix it in the next release.

> HDFS DataNode to NameNode RPC should timeout
> --------------------------------------------
>
>                 Key: HDFS-4858
>                 URL: https://issues.apache.org/jira/browse/HDFS-4858
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 3.0.0, 2.1.0-beta, 2.0.4-alpha, 2.0.5-alpha
>         Environment: Redhat/CentOS 6.4 64 bit Linux
>            Reporter: Jagane Sundar
>            Assignee: Konstantin Boudnik
>            Priority: Minor
>             Fix For: 3.0.0, 2.3.0
>
>         Attachments: HDFS-4858.patch, HDFS-4858.patch
>
>
> The DataNode is configured with ipc.client.ping false and ipc.ping.interval 14000. This
configuration means that the IPC Client (DataNode, in this case) should timeout in 14000 seconds
if the Standby NameNode does not respond to a sendHeartbeat.
> What we observe is this: If the Standby NameNode happens to reboot for any reason, the
DataNodes that are heartbeating to this Standby get stuck forever while trying to sendHeartbeat.
See Stack trace included below. When the Standby NameNode comes back up, we find that the
DataNode never re-registers with the Standby NameNode. Thereafter failover completely fails.
> The desired behavior is that the DataNode's sendHeartbeat should timeout in 14 seconds,
and keep retrying till the Standby NameNode comes back up. When it does, the DataNode should
reconnect, re-register, and offer service.
> Specifically, in the class DatanodeProtocolClientSideTranslatorPB.java, the method createNamenode
should use RPC.getProtocolProxy and not RPC.getProxy to create the DatanodeProtocolPB object.
> Stack trace of thread stuck in the DataNode after the Standby NN has rebooted:
> Thread 25 (DataNode: [file:///opt/hadoop/data]  heartbeating to vmhost6-vm1/10.10.10.151:8020):
>   State: WAITING
>   Blocked count: 23843
>   Waited count: 45676
>   Waiting on org.apache.hadoop.ipc.Client$Call@305ab6c5
>   Stack:
>     java.lang.Object.wait(Native Method)
>     java.lang.Object.wait(Object.java:485)
>     org.apache.hadoop.ipc.Client.call(Client.java:1220)
>     org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
>     sun.proxy.$Proxy10.sendHeartbeat(Unknown Source)
>     sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     java.lang.reflect.Method.invoke(Method.java:597)
>     org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
>     org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
>     sun.proxy.$Proxy10.sendHeartbeat(Unknown Source)
>     org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.sendHeartbeat(DatanodeProtocolClientSideTranslatorPB.java:167)
>     org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:445)
>     org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:525)
>     org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:676)
>     java.lang.Thread.run(Thread.java:662)
> DataNode RPC to Standby NameNode never times out. 



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