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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:
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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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