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https://issues.apache.org/jira/browse/SOLR-9512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503044#comment-15503044
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Noble Paul commented on SOLR-9512:
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bq.Looking at HttpSolrCall it appears that it's only used in /select requests,
It must be a serious bug. Without proper invalidation, the caching is useless
> 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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