1 is the minimum :) 2 makes no sense. 3 must be the most common number in the zoo.
Otis -- Performance Monitoring - http://sematext.com/spm/index.html Search Analytics - http://sematext.com/search-analytics/index.html On Thu, Dec 6, 2012 at 9:46 AM, Jack Krupansky <j...@basetechnology.com>wrote: > "but if those same machines are running zookeeper, you need 3." > > And one of those 3 can go down? I thought 3 was the minimum number of > zookeepers. > > -- Jack Krupansky > > -----Original Message----- From: Mark Miller > Sent: Thursday, December 06, 2012 9:30 AM > To: solr-user@lucene.apache.org > Subject: Re: Minimum HA Setup with SolrCloud > > > It depends on if you are running embedded zk or an external zk ensemble. > > One leader and a replica is all you need for Solr to allow on machine to > go down - but if those same machines are running zookeeper, you need 3. > > You could also run zookeeper on one external machine and then it would be > fine if you lost one solr node - but if you the one external zk node went > down you would lose the ability to do updates until it was brought back up. > > - Mark > > On Dec 6, 2012, at 2:46 AM, Thomas Heigl <tho...@umschalt.com> wrote: > > Hey all, >> >> I'm in the process of migrating a single Solr 4.0 instace to a SolrCloud >> setup for availability reasons. >> >> After studying the wiki page for SolrCloud I'm not sure what the absolute >> minimum setup is that would allow for one machine to go down. >> >> Would it be enough to have one shard with one leader and one replica? >> Could >> this setup tolerate one of the instances going down? Or do I need three >> instance because Zookeeper needs a quorum of instances? >> >> Cheers, >> >> Thomas >> > >
