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https://issues.apache.org/jira/browse/SOLR-9836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15755004#comment-15755004
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Mike Drob commented on SOLR-9836:
---------------------------------

bq. This should already be Lucene's behavior. I assume if it's not falling back 
it's because there is no previous segments file to fall back to. 
I didn't see Lucene doing this. Or at least, I didn't see Solr leverage Lucene 
to do this. Both through manual inspection of the code and through testing via 
{{MissingSegmentRecoveryTest::testRollback}} in my patch.

> Add more graceful recovery steps when failing to create SolrCore
> ----------------------------------------------------------------
>
>                 Key: SOLR-9836
>                 URL: https://issues.apache.org/jira/browse/SOLR-9836
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>            Reporter: Mike Drob
>         Attachments: SOLR-9836.patch, SOLR-9836.patch
>
>
> I have seen several cases where there is a zero-length segments_n file. We 
> haven't identified the root cause of these issues (possibly a poorly timed 
> crash during replication?) but if there is another node available then Solr 
> should be able to recover from this situation. Currently, we log and give up 
> on loading that core, leaving the user to manually intervene.



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