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https://issues.apache.org/jira/browse/SOLR-9512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509483#comment-15509483
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ASF subversion and git services commented on SOLR-9512:
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Commit bae66f7cca8cff796d142eb19585d8e79fae34f8 in lucene-solr's branch 
refs/heads/branch_6x from [~romseygeek]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=bae66f7 ]

SOLR-9305, SOLR-9390: Don't use directToLeaders updates in partition tests (see 
SOLR-9512)


> CloudSolrClient's cluster state cache can break direct updates to leaders
> -------------------------------------------------------------------------
>
>                 Key: SOLR-9512
>                 URL: https://issues.apache.org/jira/browse/SOLR-9512
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Alan Woodward
>         Attachments: SOLR-9512.patch
>
>
> This is the root cause of SOLR-9305 and (at least some of) SOLR-9390.  The 
> process goes something like this:
> Documents are added to the cluster via a CloudSolrClient, with 
> directUpdatesToLeadersOnly set to true.  CSC caches its view of the 
> DocCollection.  The leader then goes down, and is reassigned.  Next time 
> documents are added, CSC checks its cache again, and gets the old view of the 
> DocCollection.  It then tries to send the update directly to the old, now 
> down, leader, and we get ConnectionRefused.



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