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From "Yonik Seeley (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3167) Allow running embedded zookeeper 1 for 1 dynamically with solr nodes
Date Mon, 27 Feb 2012 15:02:49 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217213#comment-13217213
] 

Yonik Seeley commented on SOLR-3167:
------------------------------------

bq. Have you considered cluster auto-discover so a new node can be bootsrapped with no ZK
host/port info at all?

Yeah, that's really part of this issue.  Once we can dynamically change the ZK list, we need
to pair that with a discovery mechanism so one can just start up a node (with possibly an
optional cluster ID) and solr can find the existing ZK quorum, create a new internal ZK server
if needed, add it to the ZK quorum, etc.

Or maybe you were taking about bootstrapping w/ no ZK host/port info when you've configured
an external ZK quorum?  Haven't thought about that (or if it would make sense or not).
                
> Allow running embedded zookeeper 1 for 1 dynamically with solr nodes
> --------------------------------------------------------------------
>
>                 Key: SOLR-3167
>                 URL: https://issues.apache.org/jira/browse/SOLR-3167
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.0
>
>
> Right now you have to decide which nodes run zookeeper up front - each node must know
the list of all the servers in the ensemble. Growing or shrinking the list of nodes requires
a rolling restart. https://issues.apache.org/jira/browse/ZOOKEEPER-1355 (Add zk.updateServerList(newServerList)
might be able to help us here. Perhaps the over seer could make a call to each replica when
the list changes and use the update server list call.

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