Thanks Erick for the response I am currently using a load balancer for my solrcloud, but was particularly interested to know if solrcloud is doing load balancing internally in the case of a single shard. All the documentation that I have seen assumes multi-shard scenarios but not for a single shard. Can you please point me to some code/documenation that can help me understand this better.
Thanks Jay On Sat, Oct 22, 2016 at 6:00 PM, Erick Erickson <erickerick...@gmail.com> wrote: > 1) Single shards have some short circuiting in them. And anyway it's > best to have some kind of load balancer in front or use SolrJ with > CloudSolrClient. If you just use an HTTP end-point, you have a single > point of failure if that node goes down. > > 2) yes. What it does _not_ include is the time taken to assemble the > final document list, i.e. get the "fl" parameters. And also note that > there's "the laggard problem" here. The time will be something close > to the _longest_ time it takes any replica to respond. Say you have 4 > shards and the replica for one of them happens to hit a 5 second > stop-the-world GC collection. Your QTime will be 5 seconds+. I really > have no idea whether the QTime includes the decision process for > selecting nodes, but I've also never heard of it being significant. > > 3) I guess, although I'm not quite sure I understand the question. > Slow queries will include (roughly) the max of the sub-request QTimes. > > Best, > Erick > > On Sat, Oct 22, 2016 at 5:19 PM, Jay Potharaju <jspothar...@gmail.com> > wrote: > > Hi, > > I am trying to understand how load balancing works in solrcloud. > > > > As per my understanding solrcloud provides load balancing when querying > > using an http endpoint. When a query is sent to any of the nodes , solr > > will intelligently decide which server can fulfill the request and will > be > > processed by one of the nodes in the cluster. > > > > 1) Does the logic change when there is only 1 shard vs multiple shards? > > > > 2) Does the QTime displayed is sum of processing time for the query > request > > + latency(if processed by another node) + time to decide which node will > > process the request(which i am guessing is minimal and can be ignored) > > > > 3) In my solr logs i display the "slow" queries, is the qtime displayed > > takes all of the above and shows the correct time taken. > > > > Solr version: 5.5.0 > > > > > > -- > > Thanks > > Jay > -- Thanks Jay Potharaju
