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https://issues.apache.org/jira/browse/SOLR-3994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484671#comment-13484671
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Mark Miller commented on SOLR-3994:
-----------------------------------

I wrote a test that fires up N cores (doing 20 at the moment) fairly 
concurrently - and then unloads them all fairly concurrently.

This found a variety of minor nit issues and one more major issue - "dead lock" 
around shutting down cores - a solrcore might be closed in the recovery thread 
which may then trigger a cancel recovery that can never finish because it's 
being called from the recovery thread.

Fixed the nits, fixed that issue, will create a JIRA for it and commit that fix 
with the nit fixes.

                
> Create more extensive tests around unloading cores.
> ---------------------------------------------------
>
>                 Key: SOLR-3994
>                 URL: https://issues.apache.org/jira/browse/SOLR-3994
>             Project: Solr
>          Issue Type: Task
>          Components: SolrCloud
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.1, 5.0
>
>


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