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https://issues.apache.org/jira/browse/SOLR-12727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16699943#comment-16699943
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Erick Erickson commented on SOLR-12727:
---------------------------------------

More tests passing with suggestions from [~risdenk]. Patch attached. The two 
that are of most interest now are:
{quote}TestSolrCloudWithHadoopAuthPlugin
 TestSolrCloudWithKerberosAlt
{quote}
 

I'll run a bunch of iterations over the full test suite overnight to see what 
else pops out. I'm playing a bit of "whack a mole" as when some tests get 
fixed, others seem to pop out....

BasicDistributedZkTest is still a problem too, but I'm not sure it's this 
change or the general flakiness of that test, likely the latter.

> Upgrade ZooKeeper dependency to 3.4.13
> --------------------------------------
>
>                 Key: SOLR-12727
>                 URL: https://issues.apache.org/jira/browse/SOLR-12727
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>    Affects Versions: 7.4
>            Reporter: Shawn Heisey
>            Assignee: Erick Erickson
>            Priority: Major
>         Attachments: SOLR-12727.patch, SOLR-12727.patch, SOLR-12727.patch
>
>
> Upgrade ZK dependency to 3.4.13.  This fixes ZOOKEEPER-2184 which will make 
> the ZK client re-resolve the server hostnames when a connection fails.  This 
> will fix issues where a failed ZK container is replaced with a new one that 
> has a different IP address and DNS gets updated with the new address.
> Typically these upgrades do not require code changes, but that should be 
> verified.



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