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https://issues.apache.org/jira/browse/SOLR-6406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009016#comment-15009016
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Yonik Seeley commented on SOLR-6406:
------------------------------------

So increasing maxConnectionsPerHost didn't fix the problem.
I instrumented the ConcurrentUpdateSolrServer to try and understand what is 
happening when, and am analyzing some of those fails now.
They are all beyond the max size that can be uploaded to JIRA though, so I'lll 
just put up a summary based on what I find.

> ConcurrentUpdateSolrServer hang in blockUntilFinished.
> ------------------------------------------------------
>
>                 Key: SOLR-6406
>                 URL: https://issues.apache.org/jira/browse/SOLR-6406
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Yonik Seeley
>             Fix For: 5.4, Trunk
>
>         Attachments: CPU Sampling.png, SOLR-6406.patch, SOLR-6406.patch, 
> SOLR-6406.patch
>
>
> Not sure what is causing this, but SOLR-6136 may have taken us a step back 
> here. I see this problem occasionally pop up in ChaosMonkeyNothingIsSafeTest 
> now - test fails because of a thread leak, thread leak is due to a 
> ConcurrentUpdateSolrServer hang in blockUntilFinished. Only started popping 
> up recently.



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