Hi Marcin, Since you are thinking of this in the context of Amazon, I would suggest taking a different route. Assign an Elastic IP (EIP) to each EC2 instance running the ZK node & use the EIP in Solr. This way you could easily map the EIP to a new EC2 instance subsequently, if required, and the changes would get picked up by Solr automatically without a restart.
Regards, Aloke On Sun, Dec 30, 2012 at 8:29 PM, Marcin Rzewucki <mrzewu...@gmail.com>wrote: > Hi, > Thanks for your replies. I don't change ZK hosts a lot of times. I'm using > Amazon platform and if a ZK host is not available I will start new EC2 > instance and will have to plug it to Solr configuration (restart required). > In case of load balancer this would be much easier (no need to restart > solr). > > Regards. > > > On 30 December 2012 04:06, Anirudha Jadhav <aniru...@nyu.edu> wrote: > > > A zookeeper ensemble should be a fairly reliable, large enough no.of > > machines(3+ typically 5,7,9) for a quorum. > > So adding a load balancer on top will just add a hop and > > decrease performance, and also add a failure point in the system. > > > > that being said there needs to be a way to provide solr with a way to > > refresh conf. without restart. > > > > Solr takes a list of zk hosts on startup, If i am correct , uses one of > > them unless it fails or round robins. > > > > why do your zkhosts need to change a lot? > > > > > > On Sat, Dec 29, 2012 at 10:58 AM, Upayavira <u...@odoko.co.uk> wrote: > > > > > I would suggest asking this on the zookeeper user list. > > > > > > And let us know here what you find out, I'd be interested. > > > > > > Note, zookeeper, as I understand it, uses its own protocol, so to some > > > reasonable extent it probablmy depends on yr load balancer. Also, as I > > > understand it, zookeeper maintains active connections to solr hosts, > > > which is not a common scenario for load balances as I understand it. > > > > > > Upayavira > > > > > > On Fri, Dec 28, 2012, at 04:39 PM, Marcin Rzewucki wrote: > > > > Hi, > > > > > > > > Does Solr need connection to all of hosts in ZK ensemble or only to > one > > > > of > > > > them at a time ? I wonder if it is possible to use load balancer for > ZK > > > > ensemble and use only one address as zkHost for Solr ? Having load > > > > balancer > > > > makes it easier to change ZK hosts while still using same address by > > Solr > > > > (no need to restart Solr or change its configuration). > > > > > > > > Thanks in advance. > > > > Regards. > > > > > > > > > > > -- > > Anirudha P. Jadhav > > >
