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Posted to solr-user@lucene.apache.org by Rohit Harchandani <rh...@gmail.com> on 2012/11/13 23:46:08 UTC
Run multiple instances of solr using single data directory
Hi All,
I am currently using solr 4.0. The application I am working on requires a
high rate of queries per second.
Currently, we have setup a single master and a single slave on a production
machine. We want to bring up multiple instances of solr (slaves). Are there
any problems, when bringing them up on different ports but using the same
data directory? These will be only serving up queries and all the indexing
will take place on the master machine.
Also, if i have multiple instances from the same data directory and i
perform replication. Would that re-open searchers on all the instances?
Thanks,
Rohit
Re: Run multiple instances of solr using single data directory
Posted by Erick Erickson <er...@gmail.com>.
I think this is rather dangerous. How would these multiple slaves
coordinate replication? Would they all replicate at once? If only one was
configured to replicate, how would the others know to reopen serchers?
Furthermore, simply opening up more Solr instances on the same machine
isn't expanding the resources that need to be expanded, e.g. physical
memory to increase throughput.
Separate machines with separate their own disks for your slaves is _much_
safer and actually expands capacity. After all, if the CPU is pegged on
your slave machine under hight CPU load, starting up additional JVMs on
that machine won't get you any more CPU cycles.
Best
Erick
On Wed, Nov 14, 2012 at 12:23 PM, Rohit Harchandani <rh...@gmail.com>wrote:
> ok. but what are the problems when brining up multiple instances reading
> from the same data directory?
> also how to re-open the searchers without restarting solr?
> Thanks,
> Rohit
>
>
> On Tue, Nov 13, 2012 at 11:20 PM, Otis Gospodnetic <
> otis.gospodnetic@gmail.com> wrote:
>
> > Hi,
> >
> > If you have high query rate, running multiple instances of Solr on the
> same
> > server doesn't typically make sense. I'd stop and rethink.... :)
> >
> > Otis
> > --
> > Solr Performance Monitoring - http://sematext.com/spm/index.html
> >
> >
> > On Tue, Nov 13, 2012 at 5:46 PM, Rohit Harchandani <rharchu@gmail.com
> > >wrote:
> >
> > > Hi All,
> > > I am currently using solr 4.0. The application I am working on
> requires a
> > > high rate of queries per second.
> > > Currently, we have setup a single master and a single slave on a
> > production
> > > machine. We want to bring up multiple instances of solr (slaves). Are
> > there
> > > any problems, when bringing them up on different ports but using the
> same
> > > data directory? These will be only serving up queries and all the
> > indexing
> > > will take place on the master machine.
> > >
> > > Also, if i have multiple instances from the same data directory and i
> > > perform replication. Would that re-open searchers on all the instances?
> > > Thanks,
> > > Rohit
> > >
> >
>
Re: Run multiple instances of solr using single data directory
Posted by Rohit Harchandani <rh...@gmail.com>.
ok. but what are the problems when brining up multiple instances reading
from the same data directory?
also how to re-open the searchers without restarting solr?
Thanks,
Rohit
On Tue, Nov 13, 2012 at 11:20 PM, Otis Gospodnetic <
otis.gospodnetic@gmail.com> wrote:
> Hi,
>
> If you have high query rate, running multiple instances of Solr on the same
> server doesn't typically make sense. I'd stop and rethink.... :)
>
> Otis
> --
> Solr Performance Monitoring - http://sematext.com/spm/index.html
>
>
> On Tue, Nov 13, 2012 at 5:46 PM, Rohit Harchandani <rharchu@gmail.com
> >wrote:
>
> > Hi All,
> > I am currently using solr 4.0. The application I am working on requires a
> > high rate of queries per second.
> > Currently, we have setup a single master and a single slave on a
> production
> > machine. We want to bring up multiple instances of solr (slaves). Are
> there
> > any problems, when bringing them up on different ports but using the same
> > data directory? These will be only serving up queries and all the
> indexing
> > will take place on the master machine.
> >
> > Also, if i have multiple instances from the same data directory and i
> > perform replication. Would that re-open searchers on all the instances?
> > Thanks,
> > Rohit
> >
>
Re: Run multiple instances of solr using single data directory
Posted by Otis Gospodnetic <ot...@gmail.com>.
Hi,
If you have high query rate, running multiple instances of Solr on the same
server doesn't typically make sense. I'd stop and rethink.... :)
Otis
--
Solr Performance Monitoring - http://sematext.com/spm/index.html
On Tue, Nov 13, 2012 at 5:46 PM, Rohit Harchandani <rh...@gmail.com>wrote:
> Hi All,
> I am currently using solr 4.0. The application I am working on requires a
> high rate of queries per second.
> Currently, we have setup a single master and a single slave on a production
> machine. We want to bring up multiple instances of solr (slaves). Are there
> any problems, when bringing them up on different ports but using the same
> data directory? These will be only serving up queries and all the indexing
> will take place on the master machine.
>
> Also, if i have multiple instances from the same data directory and i
> perform replication. Would that re-open searchers on all the instances?
> Thanks,
> Rohit
>