[jira] [Commented] (SOLR-8062) Solr should raise an exception if minRf is specified and not achieved for an update request

["Shai Erera (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995639#comment-14995639 ] 

Shai Erera commented on SOLR-8062:
----------------------------------

I wanted to share a possible confusion on the user end, if we start throwing exceptions.

Since Solr (and Lucene for that matter) is unable to rollback a specific update request, I believe that's the reason why 'minRF' is used only as a hint, and telling the user that the update request didn't achieve it. By not throwing the exception, the user/client couldn't _think_ that the update request was unsuccessful, and in fact, I believe that in many cases the update itself did reach the failed replicas eventually.

If we start throwing an exception, I worry that users might think that the update request was unsuccessful as a whole. If they care, they might re-issue the request. But if they don't, then they might not realize that the update *did* get through, and even reach the failed replicas eventually. This might cause 'surprises' and inconsistency between what the user thinks is in the index and what isn't.

I personally think that an exception is better than just a warning in the response, but wanted to raise this potential confusion, in case others have an opinion on it. Perhaps if we throw an explicit exception it will be easier to note by users, i.e. {{UpdateNotFullyAppliedException}} or something like that. It's not a total update failure, but it is some sort of failure cause we weren't able to meet the client's requirements.

> Solr should raise an exception if minRf is specified and not achieved for an update request
> -------------------------------------------------------------------------------------------
>
>                 Key: SOLR-8062
>                 URL: https://issues.apache.org/jira/browse/SOLR-8062
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Timothy Potter
>
> See discussion in SOLR-8034



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