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Posted to dev@lucene.apache.org by "Noble Paul (JIRA)" <ji...@apache.org> on 2014/11/02 09:07:34 UTC
[jira] [Commented] (SOLR-6517) CollectionsAPI call REBALANCELEADERS
[ https://issues.apache.org/jira/browse/SOLR-6517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193752#comment-14193752 ]
Noble Paul commented on SOLR-6517:
----------------------------------
bq.So REBALANCELEADERS will cause any shard where the current leader is not the preferredLeader to re-elect leadership.
As I see in the code code it just sends a message to overseer to change the leader of the shard.
> 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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