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https://issues.apache.org/jira/browse/SOLR-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul reassigned SOLR-5476:
--------------------------------
Assignee: Noble Paul
> 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
>
> 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=assignRole&whitelist=overseer&node=192.168.1.5:8983_solr&node=192.168.1.6:8983_solr
> This results in the creation of a entry in the /roles.json in ZK which would
> look like the following
> {
> "overseer" : {
> "whitelist":["192.168.1.5:8983_solr",
> "192.168.1.6:8983_solr"]
> }
> }
> If a node is whitelisted for overseer it gets preference over others when
> overseer election takes place. If no whitelisted servers are available
> another random node would become the Overseer.
> Later on, if one of the whitelisted 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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