On Feb 26, 2013, at 5:25 PM, varun srivastava <varunmail...@gmail.com> wrote:
> Hi All, > I have some questions regarding role of zookeeper in solrcloud runtime, > while processing the queries . > > 1) Is zookeeper cluster referred by solr shards for processing every > request, or its only used to copy config on startup time ? No, it's not used per request. Solr talks to ZooKeeper on SolrCore startup - to get configs and set itself up. Then it only talks to ZooKeeper when a cluster state change happens - in that case, ZooKeeper pings Solr and Solr will get an update view of the cluster. That view is cached and used for requests. In a stable state, Solr is not talking to ZooKeeper other than the heartbeat they keep to know a node is up. > 2) How loadbalancing is done between replicas ? Is traffic stat shared > through zookeeper ? Basic round robin. Traffic stats are not currently in Zk. > 3) If for any reason zookeeper cluster goes offline for sometime, does solr > cloud will not be able to server any traffic ? It will stop allowing updates, but continue serving searches. - Mark > > > Thanks > Varun
