Re: How to add second Zookeeper to same machine?
On 8/20/2015 1:49 AM, Merlin Morgenstern wrote: > I am running 2 dedicated servers on which I plan to install Solrcloud with > 2 solr nodes and 3 ZK. > > From Stackoverflow I learned that the best method for autostarting > zookeeper on ubuntu 14.04 is to install it via "apt-get install > zookeeperd". I have that running now. > > How could I add a second zookeeper to one machine? The config only allows > one. Or if this is not possible, what would be the recommended way to get 3 > ZK on 2 dedicated running? > > I have followed a tutorial where I have that setup available va bash > script, but it seems that the ubuntu zookeeper setup is robust as it offers > zombie processes and a startup script as well. It is possible to have multiple zookeeper installs on one machine, but if you do this, your system will not be fault tolerant. A simple fact of life is that hardware can fail, and it can fail completely. If the motherboard in a server develops a fault, the entire server is probably going to fail. If the machine with two zookeepers on it dies, zookeeper quorum will be lost and SolrCloud will go read-only. It will not be possible to write to it, even though there is still a surviving machine. Redundant zookeeper requires three completely separate machines, so that if you lose any one of those machines, the cluster still has a majority present and stays completely operational. This means that SolrCloud requires three machines minimum. The third server can be a much less capable machine that runs zookeeper only, but it must be there in order to achieve true fault tolerance. Thanks, Shawn
Re: How to add second Zookeeper to same machine?
You might want to look into the following documentation. These documents have explanation on how to setup Zookeeper ensemble and Zookeeper administration. https://cwiki.apache.org/confluence/display/solr/Setting+Up+an+External+ZooKeeper+Ensemble http://zookeeper.apache.org/doc/r3.4.6/zookeeperAdmin.html Regards, Modassar On Thu, Aug 20, 2015 at 1:19 PM, Merlin Morgenstern < merlin.morgenst...@gmail.com> wrote: > I am running 2 dedicated servers on which I plan to install Solrcloud with > 2 solr nodes and 3 ZK. > > From Stackoverflow I learned that the best method for autostarting > zookeeper on ubuntu 14.04 is to install it via "apt-get install > zookeeperd". I have that running now. > > How could I add a second zookeeper to one machine? The config only allows > one. Or if this is not possible, what would be the recommended way to get 3 > ZK on 2 dedicated running? > > I have followed a tutorial where I have that setup available va bash > script, but it seems that the ubuntu zookeeper setup is robust as it offers > zombie processes and a startup script as well. > > Thank you for any help on this. >
How to add second Zookeeper to same machine?
I am running 2 dedicated servers on which I plan to install Solrcloud with 2 solr nodes and 3 ZK. >From Stackoverflow I learned that the best method for autostarting zookeeper on ubuntu 14.04 is to install it via "apt-get install zookeeperd". I have that running now. How could I add a second zookeeper to one machine? The config only allows one. Or if this is not possible, what would be the recommended way to get 3 ZK on 2 dedicated running? I have followed a tutorial where I have that setup available va bash script, but it seems that the ubuntu zookeeper setup is robust as it offers zombie processes and a startup script as well. Thank you for any help on this.
