Shalin Shekhar Mangar commented on SOLR-9512:

bq. Case 6: do i understand it right that we would keep failing the indexing 
requests but 'only' until eventually the client manages to reconnect to zk?

Yes, that is correct.

> 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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