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https://issues.apache.org/jira/browse/SOLR-9512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15506019#comment-15506019
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Christine Poerschke commented on SOLR-9512:
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Hi [~romseygeek] and [~noble.paul] - am only now joining this ticket late here
since i have been on vacation.
The SOLR-9090 {{directUpdatesToLeadersOnly}} motivation/intention was for the
flag to be not a hint but a directive and for updates to 'fail fast' if there
is (temporarily or otherwise) no shard leader. Fail fast (and let the caller of
the {{CloudSolrClient}} handle alarming and retries as it sees fit) as opposed
to sending or retry-sending to a non-leader which would then forward to the
leader (and potentially still fail eventually, eventually/not-fast-slowly).
[~Marvin Justice] and I worked together on SOLR-9090 - Marvin, any thoughts on
this ticket here?
> 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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