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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5476) Overseer Role for nodes
Date Thu, 16 Jan 2014 16:26:20 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13873562#comment-13873562
] 

ASF subversion and git services commented on SOLR-5476:
-------------------------------------------------------

Commit 1558846 from [~noble.paul] in branch 'dev/trunk'
[ https://svn.apache.org/r1558846 ]

SOLR-5476 removing forbidden API usage

> Overseer Role for nodes
> -----------------------
>
>                 Key: SOLR-5476
>                 URL: https://issues.apache.org/jira/browse/SOLR-5476
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SolrCloud
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>             Fix For: 5.0, 4.7
>
>         Attachments: SOLR-5476.patch, SOLR-5476.patch, SOLR-5476.patch, SOLR-5476.patch,
SOLR-5476.patch
>
>
> In a very large cluster the Overseer is likely to be overloaded.If the same node is a
serving a few other shards it can lead to OverSeer getting slowed down due to GC pauses ,
or simply too much of work  . If the cluster is really large , it is possible to dedicate
high end h/w for OverSeers
> It works as a new collection admin command
> command=addrole&role=overseer&node=192.168.1.5:8983_solr
> This results in the creation of a entry in the /roles.json in ZK which would look like
the following
> {code:javascript}
> {
> "overseer" : ["192.168.1.5:8983_solr"]
> }
> {code}
> If a node is designated for overseer it gets preference over others when overseer election
takes place. If no designated servers are available another random node would become the Overseer.
> Later on, if one of the designated nodes are brought up ,it would take over the Overseer
role from the current Overseer to become the Overseer of the system



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