[jira] [Commented] (SOLR-12187) Replica should watch clusterstate and unload itself if its entry is removed

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[jira] [Commented] (SOLR-12187) Replica should watch clusterstate and unload itself if its entry is removed

JIRA jira@apache.org

    [ https://issues.apache.org/jira/browse/SOLR-12187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440537#comment-16440537 ]

Cao Manh Dat commented on SOLR-12187:
-------------------------------------

New patch including
 * Changes to ZkStateReader.Notification thread ([~shalinmangar] hint)
 * Make¬†UnloadCoreOnDeletedWatcher.onStateChanged thread-safe ([~ab]hint)

> Replica should watch clusterstate and unload itself if its entry is removed
> ---------------------------------------------------------------------------
>
>                 Key: SOLR-12187
>                 URL: https://issues.apache.org/jira/browse/SOLR-12187
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public)
>            Reporter: Cao Manh Dat
>            Assignee: Cao Manh Dat
>            Priority: Major
>         Attachments: SOLR-12187.patch, SOLR-12187.patch, SOLR-12187.patch, SOLR-12187.patch, SOLR-12187.patch, SOLR-12187.patch
>
>
> With the introduction of autoscaling framework, we have seen an increase in the number of issues related to the race condition between delete a replica and other stuff.
> Case 1: DeleteReplicaCmd failed to send UNLOAD request to a replica, therefore, forcefully remove its entry from clusterstate, but the replica still function normally and be able to become a leader -> SOLR-12176
> Case 2:
>  * DeleteReplicaCmd enqueue a DELETECOREOP (without sending a request to replica because the node is not live)
>  * The node start and the replica get loaded
>  * DELETECOREOP has not processed hence the replica still present in clusterstate --> pass checkStateInZk
>  * DELETECOREOP is executed, DeleteReplicaCmd finished
>  ** result 1: the replica start recovering, finish it and publish itself as ACTIVE --> state of the replica is ACTIVE
>  ** result 2: the replica throw an exception (probably: NPE)
> --> state of the replica is DOWN, not join leader election



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