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https://issues.apache.org/jira/browse/SOLR-9320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403326#comment-15403326
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Nitin Sharma commented on SOLR-9320:
------------------------------------

Thanks for clarifying on async. 

Reg 500 collections: When you run replace node on a node x and the node happens 
to have 500 cores, then all these cores need to be moved to the destination 
(and then removed from source). If you have too many cores, adding a new 
replica for every core on the destination host will take time. Wondering if you 
ran any tests with such high capacity

> A REPLACENODE command to decommission an existing node with another new node
> ----------------------------------------------------------------------------
>
>                 Key: SOLR-9320
>                 URL: https://issues.apache.org/jira/browse/SOLR-9320
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SolrCloud
>            Reporter: Noble Paul
>             Fix For: 6.1
>
>         Attachments: DELETENODE.jpeg, REPLACENODE_After.jpeg, 
> REPLACENODE_Before.jpeg, REPLACENODE_call_response.jpeg, SOLR-9320.patch, 
> SOLR-9320.patch
>
>
> The command should accept a source node and target node. recreate the 
> replicas in source node in the target and do a DLETENODE of source node



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