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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6073) Unchecked exception thrown inside of BlockReceiver cause some threads hang
Date Wed, 17 Jun 2009 23:22:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Boudnik updated HADOOP-6073:
---------------------------------------

    Status: Patch Available  (was: Open)

M.b. something along these lines (see attachment)? Moving responder.interrupt() invocation
to the finally {...} doesn't make us much good, because responder thread has to be stopped
only in case of error.

Catching Throwable and wrapping it into IOException (as Raghu suggestion) seems to do the
trick. I can confirm that I don't see any more of the 'hanging' behavior in the tests with
this patch applied.

> Unchecked exception thrown inside of BlockReceiver cause some threads hang
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-6073
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6073
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Konstantin Boudnik
>         Attachments: copy.txt.log, HADOOP-6073.patch, x2
>
>
> One is able to inject all sorts of faults into Hadoop's classes using new fault injection
framework (HADOOP-6003). 
> I've been injecting unchecked exception (RuntimeException) into BlockReceiver.receivePacket()
method before any
>   of write() operations (e.g. line 401, 449, 463, 529) and running some of the existing
HDFS tests. The injection of unchecked exceptions causes DataXceiver to die silently and without
any traces.
> From a debugger run it seems like some threads are being left alive or not notified about
the exception.

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