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

["Yaswanth (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-13396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17440882#comment-17440882 ] 

Yaswanth edited comment on SOLR-13396 at 11/9/21, 3:52 AM:
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Sorry if I am missing something here.. but can I know the status of this case? Is this still being worked out or is there a workaround ? I did faced similar issue with solr 8.2 which is quite intermittent and happened twice in production too.. so pls let me know the status of the same.


was (Author: ykonathala):
Sorry if I am missing something here.. but can I know the status of this case? Is this still being worked out or is there a workaround ? I did faced similar issue which is quite intermittent and happened twice in production too.. so pls let me know the status of the same.

> 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
>          Components: SolrCloud
>    Affects Versions: 7.3.1, 8.0
>            Reporter: Shawn Heisey
>            Priority: Major
>
> 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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