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https://issues.apache.org/jira/browse/SOLR-11011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075934#comment-16075934
 ] 

Shalin Shekhar Mangar commented on SOLR-11011:
----------------------------------------------

Nice Dat! Although this was caught while testing {{autoAddReplicasPlanAction}} 
for autoscaling, it can happen today in the wild if a user uses the 
DELETEREPLICA or MOVEREPLICA or REPLACENODE API to delete replicas and then a 
new replica is created on the same node with the same core name.

> Assign.buildCoreName can lead to error in creating a new core when 
> legacyCloud=false
> ------------------------------------------------------------------------------------
>
>                 Key: SOLR-11011
>                 URL: https://issues.apache.org/jira/browse/SOLR-11011
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Cao Manh Dat
>            Assignee: Cao Manh Dat
>
> Here are the case
> {code}
> shard1 : {
>     node1 : shard1_replica1,
>     node2 : shard1_replica2
> }
> {code}
> node2 go down, autoAddReplicasPlanAction is executed
> {code}
> shard1 : {
>     node1 : shard1_replica1,
>     node3 : shard1_replica3
> }
> {code}
> node2 back alive, because shard1_replica2 is removed from {{states.json}} so 
> that core won't be loaded ( but it won't be removed neither ). Then node1 go 
> down, Assign.buildCoreName will create a core with name=shard1_replica2 which 
> lead to a failure.



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