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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9612) HADOOP client IPC layer should differentiate between interrupted threads and interrupts occurring during operations
Date Fri, 31 May 2013 18:00:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671692#comment-13671692
] 

Daryn Sharp commented on HADOOP-9612:
-------------------------------------

Actually, it would also be great to actually propagate the interrupt.  It's very annoying
right now that the client cannot be interrupted.  For example, if you run a FsShell command
while the NN is down, you can pound on control-c but the client ignores the exception and
keeps retrying the connect.
                
> HADOOP client IPC layer should differentiate between interrupted threads and interrupts
occurring during operations
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9612
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9612
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.0.5-beta
>         Environment: Ubuntu / x86_64
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Trivial
>         Attachments: hdfs-interruptus.tgz
>
>
> Hadoop IPC throws misleading wrapped exceptions when operations are performed on threads
which have already been interrupted.
> When a thread is already interrupted, the client IPC throws the following exception
> {code}
> Exception in thread "main" java.io.IOException:
> ...
>         at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:761)
> 	at org.apache.hadoop.ipc.Client.call(Client.java:1270)
> 	at org.apache.hadoop.ipc.Client.call(Client.java:1218)
> 	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
> 	at $Proxy9.getBlockLocations(Unknown Source)
> {code}
> This is completely indistinguishable between a real interruption happening to the thread
during the client call and very misleading.
> Before client calls, it would be prudent to check for the currentThread().isInterrupted()
flag and throw a different exception to indicate the thread was already interrupted before
the operation.
> The distinction between these two is a difference in exception messaging & backtrace,
not the eventual exception thrown as such.

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