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https://issues.apache.org/jira/browse/SOLR-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894630#comment-13894630
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Mark Miller commented on SOLR-5476:
-----------------------------------
It's a huge problem. As you can see from the extremely common test fails.
Currently, you see a fail were it kills the processing thread. That race is a
big deal. I'm -1 on this for 4.7 given the problems with it. Something has to
be done that doesn't compromise the Overseer running mutually exclusively. This
is important now and for the future.
We need to ensure the Overseer cannot possibly step on itself, and this feature
pretty much ensures that it will.
I'm -1 on the feature until the implementation is fixed.
> 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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