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https://issues.apache.org/jira/browse/SOLR-6944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14300084#comment-14300084
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Mark Miller commented on SOLR-6944:
-----------------------------------

bq. ReplicationFactorTest fails on every run in Windows.

I think this could happen infrequently before on any OS - but it became more 
frequent and consistent on windows (perhaps with Jetty 9). I also saw this 
happen more when removing the httpclient stale check as well - but it can 
obviously happen with the stale check as well. It seems to be much worse on 
these tests because of the proxy stuff they do. When it does happen, you pretty 
much have to retry - NoHttpResponseException happens when the full request is 
sent, so an auto retry is not safe unless it's a query and not an update.

> ReplicationFactorTest and HttpPartitionTest both fail with 
> org.apache.http.NoHttpResponseException: The target server failed to respond
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-6944
>                 URL: https://issues.apache.org/jira/browse/SOLR-6944
>             Project: Solr
>          Issue Type: Test
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>         Attachments: SOLR-6944.patch
>
>
> Our only recourse is to do a client side retry on such errors. I have some 
> retry code for this from SOLR-4509 that I will pull over here.



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