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https://issues.apache.org/jira/browse/SOLR-12727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16696339#comment-16696339
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Erick Erickson commented on SOLR-12727:
---------------------------------------

Here's what I have so far. There were about 39 test failures to start, all but 
two required minimal effort so they pass. The result is in the patch I just 
attached. I haven't run the full test suite with the patch attached yet.

Two tests fail:

1> SaslZkACLProviderTest. I @Ignored it temporarily, I'll remove it momentarily 
locally.

2> TestMiniSolrCloudClusterSSLtestSslWithCheckPeerName fails

3> I'm taking the approach of only changing the minimal number of things to 
make tests pass. This still leaves quite a number of references to 127.0.0.1 in 
the code. I'm reluctant to just change _everything_, and there are a bunch. 
Comments?

I'll be looking at this over the next few days as I have some time to kill 
(it's finally raining here in the bay area), but I'll be flying pretty blind, 
anyone with any advice, please speak up ;).

> 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
>
>
> 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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