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https://issues.apache.org/jira/browse/SOLR-16806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727799#comment-17727799
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David Smiley commented on SOLR-16806:
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I just reviewed [HTTP PUT
info|https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PUT] yes it's
idempotent but it uses the word "resource" and related language and thus is
intended for a REST-ful scenario. For a command-verb like case, it doesn't make
sense. POST is the generic case we should use. Maybe I've been living under a
rock lately and more apps are starting to abuse this verb?
> 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
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Currently there is no way to move replicas to a new, empty, Solr node,
> without manually choosing the replicas yourself, and moving/recreating the
> replicas. 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 reaches an
> "equilibrium" with 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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