Cao Manh Dat updated SOLR-12187:
    Attachment: SOLR-12187.patch

> 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
> 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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