[jira] Resolved: (NUTCH-151) CommandRunner can hang after the main thread exec is finished and has inefficient busy loop

["Doug Cutting (JIRA)" <ji...@apache.org>]

     [ http://issues.apache.org/jira/browse/NUTCH-151?page=all ]
     
Doug Cutting resolved NUTCH-151:
--------------------------------

    Fix Version: 0.8-dev
     Resolution: Fixed

I just committed this.  Thanks, Paul!

> CommandRunner can hang after the main thread exec is finished and has inefficient busy loop
> -------------------------------------------------------------------------------------------
>
>          Key: NUTCH-151
>          URL: http://issues.apache.org/jira/browse/NUTCH-151
>      Project: Nutch
>         Type: Bug
>   Components: indexer
>     Versions: 0.8-dev
>  Environment: all
>     Reporter: Paul Baclace
>      Fix For: 0.8-dev
>  Attachments: CommandRunner.java, CommandRunner.java.patch
>
> I encountered a case where the JVM of a Tasktracker child did not exit after the main thread returned; a thread dump showed only the threads named STDOUT and STDERR from CommandRunner as non-daemon threads, and both were doing a read().
> CommandRunner usually works correctly when the subprocess is expected to be finished before the timeout or when no timeout is used. By _usually_, I mean in the absence of external thread interrupts.  The busy loop that waits for the process to finish has a sleep that is skipped over by an exception; this causes the waiting main thread to compete with the subprocess in a tight loop and effectively reduces the available cpu by 50%.

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