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https://issues.apache.org/jira/browse/SOLR-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604394#comment-13604394
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Commit Tag Bot commented on SOLR-4595:
--------------------------------------

[branch_4x commit] Mark Robert Miller
http://svn.apache.org/viewvc?view=revision&revision=1457294

SOLR-4595: CachingDirectoryFactory#close can throw a concurrent modification 
exception.

                
> CachingDirectoryFactory#close can throw a concurrent modification exception.
> ----------------------------------------------------------------------------
>
>                 Key: SOLR-4595
>                 URL: https://issues.apache.org/jira/browse/SOLR-4595
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.3, 5.0
>
>
> We release the lock tmp while waiting for any outstanding directories to be 
> returned - if that happens, the collection we are iterating on can change 
> from another thread when an outstanding directory is released. We need to 
> make our own collection rather than using the one shared with 
> byDirectoryCache.

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