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https://issues.apache.org/jira/browse/SOLR-4505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586806#comment-13586806
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Mark Miller edited comment on SOLR-4505 at 2/26/13 5:43 AM:
------------------------------------------------------------

The attached patch deals with the update lock the same as the commit lock 
(which we changed when a previous deadlock case was found).

While waiting for the Writer to be unused, we yield the lock, and then 
reacquire it when the wait is done.
                
      was (Author: [email protected]):
    The attached patch deals with the update lock the same as the commit lock 
(which we changed when a previous deadlock case was found).

While waiting for the Writer to be unused, we yield the lock, and the reacquire 
it when the wait is done.
                  
> Deadlock around SolrCoreState update lock.
> ------------------------------------------
>
>                 Key: SOLR-4505
>                 URL: https://issues.apache.org/jira/browse/SOLR-4505
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>            Priority: Minor
>             Fix For: 4.2, 5.0
>
>         Attachments: SOLR-4505.patch
>
>
> Erick found a deadlock with his core stress tool - see 
> http://markmail.org/message/aq5hghbqia2uimgl

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