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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-6491) Add preferredLeader as a ROLE and a collecitons API command to respect this role
Date Mon, 08 Sep 2014 21:27:28 GMT

    [ https://issues.apache.org/jira/browse/SOLR-6491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14126133#comment-14126133
] 

Erick Erickson commented on SOLR-6491:
--------------------------------------

I think the functionality of all three of these JIRAs will be provided by this one.

> Add preferredLeader as a ROLE and a collecitons API command to respect this role
> --------------------------------------------------------------------------------
>
>                 Key: SOLR-6491
>                 URL: https://issues.apache.org/jira/browse/SOLR-6491
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 5.0, 4.11
>            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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