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From "Michael McCandless (JIRA)" <>
Subject [jira] [Resolved] (LUCENE-6381) DocumentsWriterStallControl's .wait() should have a time limit
Date Wed, 01 Apr 2015 09:33:53 GMT


Michael McCandless resolved LUCENE-6381.
    Resolution: Fixed

> DocumentsWriterStallControl's .wait() should have a time limit
> --------------------------------------------------------------
>                 Key: LUCENE-6381
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: Trunk, 5.1
>         Attachments: LUCENE-6381.patch
> This build was hung:
> Only one thread was stalled in DocumentsWriterStallControl, which means we have a bug
somewhere, because that thread should have un-stalled once the other (too many) threads finished
flushing their segments.
> I think we should make a simple defensive change here: instead of wait(), which waits
forever for a .notify/All() to wake it up, we should wait for up to a time limit.  This way
when any concurrency bug like this strikes, we won't hang forever.
> I cannot reproduce that particular hang... what's unique about that test is it uses a
positively minuscule (1 KB) IW buffer.

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