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https://issues.apache.org/jira/browse/SOLR-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Miller resolved SOLR-4595.
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Resolution: Fixed
> 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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