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Posted to dev@lucene.apache.org by "Erick Erickson (JIRA)" <ji...@apache.org> on 2014/09/09 16:49:28 UTC
[jira] [Updated] (SOLR-6491) Add preferredLeader as a ROLE and a
collections API command to respect this role
[ https://issues.apache.org/jira/browse/SOLR-6491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Erick Erickson updated SOLR-6491:
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Summary: Add preferredLeader as a ROLE and a collections API command to respect this role (was: Add preferredLeader as a ROLE and a collecitons API command to respect this role)
> Add preferredLeader as a ROLE and a collections 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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