[jira] [Created] (SOLR-13396) SolrCloud will delete the core data for any core that is not referenced in the clusterstate

["Shawn Heisey (JIRA)" <ji...@apache.org>]

Shawn Heisey created SOLR-13396:
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             Summary: SolrCloud will delete the core data for any core that is not referenced in the clusterstate
                 Key: SOLR-13396
                 URL: https://issues.apache.org/jira/browse/SOLR-13396
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 8.0, 7.3.1
            Reporter: Shawn Heisey


SOLR-12066 is an improvement designed to delete core data for replicas that were deleted while the node was down -- better cleanup.

In practice, that change causes SolrCloud to delete all core data for cores that are not referenced in the ZK clusterstate.  If all the ZK data gets deleted or the Solr instance is pointed at a ZK ensemble with no data, it will proceed to delete all of the cores in the solr home, with no possibility of recovery.

I do not think that Solr should ever delete core data unless an explicit DELETE action has been made and the node is operational at the time of the request.  If a core exists during startup that cannot be found in the ZK clusterstate, it should be ignored (not started) and a helpful message should be logged.  I think that message should probably be at WARN so that it shows up in the admin UI logging tab with default settings.



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