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https://issues.apache.org/jira/browse/SOLR-3066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203190#comment-13203190
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Mark Miller commented on SOLR-3066:
-----------------------------------

So a lot of this seemed to be fixed by adding a higher timeout when we wait for 
the searcher open/close counts to balance out. I think this is partially 
because jenkins will run with test multipliers and so some tests start and stop 
quite a few number of jetties, so it on a slow system, it can take a little 
while for all cores to be released some times.

A couple of the tests that are currently ignored failed with bigger count 
mismatches though. I didn't want to turn those back on without more assurance 
they might pass.

So I installed freebsd in virtualbox and started playing there within the 
confines of the black hole behavior. I tried to run those two tests and indeed 
they failed - a couple stack trace dumps and I realized that some recovery 
attempt calls where hanging - I had set timeouts for the calls to 
recover/replicate, but not for the calls to sync. I added the timeouts and 
those tests started passing.

So things are looking okay, except that i just saw that very rarely on jenkins, 
the zkrecovery test is failing with an imbalance off by one. I'll probably make 
a different issue for that less frequent case.
                
> SolrIndexSearcher open/close imbalance in some of the new SolrCloud tests.
> --------------------------------------------------------------------------
>
>                 Key: SOLR-3066
>                 URL: https://issues.apache.org/jira/browse/SOLR-3066
>             Project: Solr
>          Issue Type: Test
>            Reporter: Mark Miller
>
> I have not been able to duplicate this test issue on my systems yet, but on 
> jenkins, some tests that start and stop jetty instances during the test are 
> having trouble cleaning up and can bleed into other tests. I'm working on 
> isolating the reason for this - I seem to have been ip banned from jenkins at 
> the moment, but when I can ssh in there, I will be able to speed up the 
> try/feedback loop some. I've spent a lot of time trying to duplicate across 3 
> other systems, but I don't see the same issue anywhere but our jenkins server 
> thus far.

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