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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