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From "Christoph Goller (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LUCENE-2783) Deadlock in IndexWriter
Date Mon, 29 Nov 2010 10:38:38 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christoph Goller closed LUCENE-2783.
------------------------------------

    Resolution: Fixed

Already fixed with introduction of mergeDone flag in OneMerge of Lucene upcoming 2.9.4

> Deadlock in IndexWriter
> -----------------------
>
>                 Key: LUCENE-2783
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2783
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.9.3
>         Environment: ALL
>            Reporter: Christoph Goller
>             Fix For: 2.9.4
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> If autoCommit == true a merge usually triggers a commit. A commit (prepareCommit) can
trigger a merge vi the flush method. There is a synchronization mechanism for commit (commitLock)
and a separate synchronization mechanism for merging (ConcurrentMergeScheduler.wait). If one
thread holds the commitLock monitor and another one holds the ConcurrentMergeScheduler monitor
we have a deadlock.

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