ZooKeeper / /clusterstate.json - info about the layout and state of the cluster - collections, shards, urls, etc /collections - config to use for the collection, shard leader voting zk nodes /configs - sets of config files /live_nodes - ephemeral nodes, one per Solr node /overseer - work queue for update clusterstate.json, creating new collections, etc /overseer_elect - overseer voting zk nodes
- Mark On Feb 26, 2013, at 6:18 PM, varun srivastava <varunmail...@gmail.com> wrote: > Hi Mark, > One more question > > While doing solr doc update/add what information is required from zookeeper > ? Can you tell what all information is stored in zookeeper other than the > startup configs. > > Thanks > Varun > > On Tue, Feb 26, 2013 at 3:09 PM, Mark Miller <markrmil...@gmail.com> wrote: > >> >> 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 >> >>
