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https://issues.apache.org/jira/browse/SOLR-18008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Pugh updated SOLR-18008:
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Summary: Allow Core Creation when remnant files are still on disk (was:
Allow Core Creation when remnant files are on disk)
> Allow Core Creation when remnant files are still on disk
> --------------------------------------------------------
>
> Key: SOLR-18008
> URL: https://issues.apache.org/jira/browse/SOLR-18008
> Project: Solr
> Issue Type: Bug
> Affects Versions: 8.11, 9.8
> Reporter: Eric Pugh
> Priority: Major
>
> Today in some production systems where we delete and create collections with
> the same name, we sometimes have left over files after deleting the cores.
> The existence of these files causes any future collection creation to fail
> because when the individual core is created, we see we already have the
> remnant on disk.
> See the BATS test
> [https://github.com/apache/solr/blob/4d86c8cd128d59a65476dded34ec9c1947e67778/solr/packaging/test/test_create_collection2.bats]
> for an example of this situation.
> In a perfect world of course we wouldn't have these remnants, however I
> currently don't have the ability to debug why they intermittantly happen. I
> only know that when we go to make a new one we get errors similar to:
> Error CREATEing SolrCore xxxxxx: Could not create a new core in
> /var/solr/xxxxxx *as another core is already defined there*
> RequestHandlerBaseorg.apache.solr.common.SolrException: *Cannot unload
> non-existent core*
> Underlying core creation failed while creating collection
>
> The fix is unfortunantly to log onto the specific Solr box and execute a
> command similar to:
>
> rm -rf
> /var/solr/master_\{nameOfCollection}_\{indexMode}{shardNumber}\{replicaNumber}
> This Jira is to explore how we can at least handle this failure case in a
> better way, and allow the new create collection command to go through.
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