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https://issues.apache.org/jira/browse/SOLR-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13895614#comment-13895614
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Mark Miller commented on SOLR-5476:
-----------------------------------
bq. Again , the problem of Overlap because of long running operations is no
just restricted to the Overseer Roles feature it can happen otherwise too.
It's not likely to happen otherwise. Those checks that you are now using like a
feature are really just fail safes. Emergency shutoffs to minimize damage in a
bad situation. They are not meant to be hit. Normally an Overseer will be an
Overseer until it dies, crashes, cases to exist. There will be no overlap in
any normal circumstances.
This patch changes that.
> 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, 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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