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https://issues.apache.org/jira/browse/SOLR-6491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138967#comment-14138967
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Noble Paul commented on SOLR-6491:
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bq.So it's feeling like we can carry this idea forward,
yeah I would like it in the following order
# rebalanceLeaders . params (collection, shard(optional))
# switchLeader . params (collection, shard, targetReplicaName)
# I'm not a fan of the preferredLeader thing . This information is persisted
and the ops guy will have no clue where he assigned the leader. Or worse,
another ops guy would take over and he will be completely clueless . I'm
already the culprit of the overseer role feature. But, my defense would be
that, it is only one node for the entire cluster and it can't be too bad
> Umbrella JIRA for managing the leader assignments
> -------------------------------------------------
>
> Key: SOLR-6491
> URL: https://issues.apache.org/jira/browse/SOLR-6491
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 5.0, 6.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
>
> Leaders can currently get out of balance due to the sequence of how nodes are
> brought up in a cluster. For very good reasons shard leadership cannot be
> permanently assigned.
> However, it seems reasonable that a sys admin could optionally specify that a
> particular node be the _preferred_ leader for a particular collection/shard.
> During leader election, preference would be given to any node so marked when
> electing any leader.
> So the proposal here is to add another role for preferredLeader to the
> collections API, something like
> ADDROLE?role=preferredLeader&collection=collection_name&shard=shardId
> Second, it would be good to have a new collections API call like
> ELECTPREFERREDLEADERS?collection=collection_name
> (I really hate that name so far, but you see the idea). That command would
> (asynchronously?) make an attempt to transfer leadership for each shard in a
> collection to the leader labeled as the preferred leader by the new ADDROLE
> role.
> I'm going to start working on this, any suggestions welcome!
> This will subsume several other JIRAs, I'll link them momentarily.
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