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https://issues.apache.org/jira/browse/SOLR-6517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14188690#comment-14188690
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Erick Erickson commented on SOLR-6517:
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There's some information here:
https://cwiki.apache.org/confluence/display/solr/Collections+API#CollectionsAPI-RebalanceLeaders
Basically, though, it just queues up Overseer.OverseerAction.LEADER commands.
There's a little bit of overloading here.
CollectionsHandler.handleBalanceLeaders does the throttling of how many
outstanding requests there are, and
OverseerCollectionsProcessor.processAssignLeaders just queues up a
Overseer.OverseerAction.LEADER.toLower() call for the Overseer to execute.
Yeah, as the notes above indicate I'm perfectly aware that I should mention the
JIRA in the message, just managed to forget once.
> CollectionsAPI call REBALANCELEADERS
> ------------------------------------
>
> Key: SOLR-6517
> URL: https://issues.apache.org/jira/browse/SOLR-6517
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 5.0, Trunk
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Fix For: 5.0, Trunk
>
> Attachments: SOLR-6517.patch, SOLR-6517.patch, SOLR-6517.patch
>
>
> Perhaps the final piece of SOLR-6491. Once the preferred leadership roles are
> assigned, there has to be a command "make it so Mr. Solr". This is something
> of a placeholder to collect ideas. One wouldn't want to flood the system with
> hundreds of re-assignments at once. Should this be synchronous or asnych?
> Should it make the best attempt but not worry about perfection? Should it???
> a collection=name parameter would be required and it would re-elect all the
> leaders that were on the 'wrong' node
> I'm thinking an optionally allowing one to specify a shard in the case where
> you wanted to make a very specific change. Note that there's no need to
> specify a particular replica, since there should be only a single
> preferredLeader per slice.
> This command would do nothing to any slice that did not have a replica with a
> preferredLeader role. Likewise it would do nothing if the slice in question
> already had the leader role assigned to the node with the preferredLeader
> role.
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