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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-4660) When ConcurrentMergeScheduler stalls incoming threads it has unexpected hysteresis
Date Fri, 04 Jan 2013 16:14:12 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless resolved LUCENE-4660.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 5.0
                   4.1
    
> When ConcurrentMergeScheduler stalls incoming threads it has unexpected hysteresis
> ----------------------------------------------------------------------------------
>
>                 Key: LUCENE-4660
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4660
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4660.patch
>
>
> Eg if you set maxMergeCount to 2, as soon as a 3rd merge need to kick off, we stall incoming
segment-creating threads.  Then we wait ... and we are supposed to resume the threads when
the merge count drops back to 2, but instead we are only resuming when merge count gets to
1.  Ie, we stall for too long (= unexpected hysteresis).

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