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From Michael Della Bitta <michael.della.bi...@appinions.com>
Subject Re: Minimum HA Setup with SolrCloud
Date Thu, 06 Dec 2012 22:00:23 GMT
One is the loneliest number that you'll ever do,
Two can be as bad as one, it's the loneliest number since the single Zoo.


Michael Della Bitta

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On Thu, Dec 6, 2012 at 4:39 PM, Otis Gospodnetic <otis.gospodnetic@gmail.com
> wrote:

> 1 is the minimum :)
> 2 makes no sense.
> 3 must be the most common number in the zoo.
>
> Otis
> --
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>
>
> On Thu, Dec 6, 2012 at 9:46 AM, Jack Krupansky <jack@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 <thomas@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
> >>
> >
> >
>

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