[jira] [Commented] (SOLR-9446) Just replicated index goes into replication recovery on leader failure even if index was not changed

["Noble Paul (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-9446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15483355#comment-15483355 ] 

Noble Paul commented on SOLR-9446:
----------------------------------

I find the following assertion commented out in the testcase

{code:java}
// assertEquals("FreshNode went into recovery", numRequestsBefore, numRequestsAfter);
{code}

I tested by uncommenting it. it is passing anyway.

> Just replicated index goes into replication recovery on leader failure even if index was not changed
> ----------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-9446
>                 URL: https://issues.apache.org/jira/browse/SOLR-9446
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: replication (java)
>            Reporter: Pushkar Raste
>            Assignee: Noble Paul
>            Priority: Minor
>
>  We noticed this issue while migrating solr index from machines {{A1, A2 and A3}} to {{B1, B2, B3}}. We followed following steps (and there were no updates during the migration process).
> * Index had replicas on machines {{A1, A2, A3}}. Let's say {{A1}} was the leader at the time
> * We added 3 more replicas {{B1, B2 and B3}}. These nodes synced with the by replication. These fresh nodes do not have tlogs.
> * We shut down one of the old nodes ({{A3}}). 
> * We then shut down the leader ({{A1}})
> * New leader got elected (let's say {{A2}}) became the new leader
> * Leader asked all the replicas to sync with it
> * Fresh nodes (ones without tlogs), first tried PeerSync but since there was no frame of reference, PeerSync failed and fresh nodes fail back on to try replication 
> Although replication would not copy all the segments again, it seems like we can short circuit sync to put nodes back in active state as soon as possible. 



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