Houston Putman created SOLR-17700:
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Summary: CoreContainer does not obtain a lock when unloading cores
Key: SOLR-17700
URL: https://issues.apache.org/jira/browse/SOLR-17700
Project: Solr
Issue Type: Bug
Reporter: Houston Putman
CoreContainer uses {{solrCores.waitAddPendingCoreOps(name)}} when doing an
operation on a core. And the documentation for
{{SolrCores.waitAddPendingCoreOps(name)}} mentions that:
bq. // Wait here until any pending operations (load, unload or reload) are
completed on this core.
However, CoreContainer does not use this locking when unloading a core. This is
the reason why we are seeing race condition issues when deleting and reloading
a collection at the same time.
Loading a core can possibly require unloading said core, when
"deleteUnknownCoresOnStartup" is used, thus we need a way of unloading without
a lock. But other than this edge case, locking the unload operation should only
improve stability in Solr.
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