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https://issues.apache.org/jira/browse/SOLR-4013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561578#comment-13561578
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Erick Erickson commented on SOLR-4013:
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I think I've already done this in SOLR-4196 which hasn't been committed yet, I
need to verify.
> Creating a core should prevent more than one thread from creating a core of
> the same name at once.
> --------------------------------------------------------------------------------------------------
>
> Key: SOLR-4013
> URL: https://issues.apache.org/jira/browse/SOLR-4013
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.1, 5.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Minor
> Fix For: 4.2, 5.0
>
>
> This hasn't been an issue so far since cores are created at startup. But in
> the lots of cores case (see SOLR-1293) the probability that more than one
> thread will attempt to create a core of the same name is vastly greater. We
> need to block other threads from creating a core if the core is already being
> created in a different thread.
> Once the core is created, the blocked thread should pick up the newly-created
> core rather than create it again.
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