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

["Sami Siren (JIRA)" <ji...@apache.org>]

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

Sami Siren closed NUTCH-151.
----------------------------


> 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
>          Issue Type: Bug
>          Components: indexer
>    Affects Versions: 0.8
>         Environment: all
>            Reporter: Paul Baclace
>             Fix For: 0.8
>
>         Attachments: CommandRunner.060110.patch, 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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