[jira] Resolved: (NUTCH-502) Bug in SegmentReader causes infinite loop

["Doğacan Güney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doğacan Güney resolved NUTCH-502.
---------------------------------

    Resolution: Fixed

Committed in rev. 548666.

> Bug in SegmentReader causes infinite loop
> -----------------------------------------
>
>                 Key: NUTCH-502
>                 URL: https://issues.apache.org/jira/browse/NUTCH-502
>             Project: Nutch
>          Issue Type: Bug
>            Reporter: Doğacan Güney
>            Assignee: Doğacan Güney
>            Priority: Minor
>             Fix For: 1.0.0
>
>         Attachments: segment_reader_hang.patch
>
>
> A small bug in SegmentReader.get() may lead to an infinite loop.
> ...
>     int cnt = 0;
>     do {
>       try {
>         Thread.sleep(5000);
>       } catch (Exception e) {};
>       it = threads.iterator();
>       while (it.hasNext()) {
>         if (((Thread)it.next()).isAlive()) cnt++;
>       }
>       if ((cnt > 0) && (LOG.isDebugEnabled())) {
>         LOG.debug("(" + cnt + " to retrieve)");
> ....
>       }
>     } while (cnt > 0); 
> If cnt ever becomes non-zero, SegmentReader gets stuck in that loop.
> This bug is discovered by Ilya Vishnevsky.

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