[jira] [Created] (SOLR-16806) Add a BalanceReplicas API

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

Houston Putman created SOLR-16806:
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             Summary: Add a BalanceReplicas API
                 Key: SOLR-16806
                 URL: https://issues.apache.org/jira/browse/SOLR-16806
             Project: Solr
          Issue Type: Sub-task
            Reporter: Houston Putman


Currently there is no way to move replicas to a new, empty, Solr node. The logic we would need for this is to choose the best replicas to move to an empty Solr node, and stop when that Solr node matches the rest of the cluster.

This logic is very close to merely balancing the existing replicas across a given set of nodes. So instead of creating a similar command that solves a subset of use-cases, it is probably worth it to take a bit more effort and create the general balance-replicas API to solve all balancing use-cases.

The API would be quite simple. It would be something like {*}PUT "/api/cluster/balanceReplicas"{*}, and it would take in a list of nodes:

{"nodes": [ "node1", "node2" ]}

If no nodes were provided in the request body, then Solr would default to balancing across all data nodes.

I don't see a need to write a V1 API for this.

This requires adding method signatures to the PlacementPlugin, but we can make them default to a NO-OP, preserving compatibility for existing custom-plugins. 



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