[jira] [Updated] (SOLR-17700) CoreContainer does not obtain a lock when unloading cores

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-17700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated SOLR-17700:
----------------------------------
    Labels: pull-request-available  (was: )

> 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
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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