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Posted to solr-user@lucene.apache.org by Furkan KAMACI <fu...@gmail.com> on 2013/04/23 20:53:57 UTC
What is cluster overseer at SolrCloud?
When I read about SolrCloud wiki there writes something about "cluster
overseer". What is the role of that at read and write processes? How can I
see which node is overseer at my cluster?
Re: What is cluster overseer at SolrCloud?
Posted by Furkan KAMACI <fu...@gmail.com>.
Thanks for the explanation.
2013/4/23 Mark Miller <ma...@gmail.com>
>
> On Apr 23, 2013, at 2:53 PM, Furkan KAMACI <fu...@gmail.com> wrote:
>
> > When I read about SolrCloud wiki there writes something about "cluster
> > overseer". What is the role of that at read and write processes? How can
> I
> > see which node is overseer at my cluster?
>
> The Overseer's main responsibility is to write the clusterstate.json file
> based on what individual nodes publish to ZooKeeper. It also does other
> things, like assign shard and node names. If the Overseer dies, another
> Overseer is elected and it starts processing the work queue where the dead
> Oveseer left off.
>
> You can see which node is the Overseer by going to the Cloud view in the
> admin UI. Click the Tree tab. Under /overseer_elect, click on the leader
> node. Part of it's id should tell you which node is acting as the overseer.
>
> - Mark
Re: What is cluster overseer at SolrCloud?
Posted by Mark Miller <ma...@gmail.com>.
On Apr 23, 2013, at 2:53 PM, Furkan KAMACI <fu...@gmail.com> wrote:
> When I read about SolrCloud wiki there writes something about "cluster
> overseer". What is the role of that at read and write processes? How can I
> see which node is overseer at my cluster?
The Overseer's main responsibility is to write the clusterstate.json file based on what individual nodes publish to ZooKeeper. It also does other things, like assign shard and node names. If the Overseer dies, another Overseer is elected and it starts processing the work queue where the dead Oveseer left off.
You can see which node is the Overseer by going to the Cloud view in the admin UI. Click the Tree tab. Under /overseer_elect, click on the leader node. Part of it's id should tell you which node is acting as the overseer.
- Mark