lucene-solr-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Lance Norskog <>
Subject Re: Solr for multiple websites
Date Sat, 21 Aug 2010 01:46:15 GMT
Some Solr terms:
Lucene Index: actual Lucene index on the disk
Solr core: Solr wrapper for a Lucene Index- core is generally used
when talking about configuring it
Solr shard: A Lucene index with a Solr wrapper, that is part of a
distributed Solr index. 'shard' specifically means a part of the whole
searchable index.

Schema: a specification for the data inside a Solr index/core/shard.
The schema should be the same among all shards in a distributed index.

Solr searches other shards with the Distributed Search feature. This
search is done by a 'broker' or 'distributor' Solr core. None of the
technical docs ever give a name to the broker, so the idea often
doesn't appear when talking about designing a distributed solr and so
it easy to get confused. Thus, people use one of the existing shard
cores to also do the broker job, causing all kinds of confusion.

I prefer to configure a separate core with no actual data. It only
does the broker job. Suppose there are 3 shards 'h1', 'h2', and 'h3'.
I make a separate core called 'h' and set up the list of cores as
invariant parameters in a <requestHandler> spec. Makes things much
more clear.

I think that Hitendra used 'schema' in the MySql usage of 1 set of
tables in an MySQL database.

On Thu, Aug 19, 2010 at 6:39 AM, Markus Jelsma <> wrote:
> Load balancing is bit out of scope here but all you need is a simple HTTP load balancer
and a replication mechanism, depending on your set up.
> -----Original message-----
> From: Hitendra Molleti <>
> Sent: Thu 19-08-2010 14:38
> To:;
> CC: 'Jonathan DeMello' <>;; 'Nishchint
Yogishwar' <>;
> Subject: RE: Solr for multiple websites
> Thanks Girjesh.
> Can you please let me know what are the pros and cons of this apporoach.
> Also, how can we setup load balancing between multiple solrs
> Thanks
> Hitendra
> -----Original Message-----
> From: Grijesh.singh []
> Sent: Thursday, August 19, 2010 10:25 AM
> To:
> Subject: Re: Solr for multiple websites
> Using multicore is the right approach
> --
> View this message in context:
> 772.html
> Sent from the Solr - User mailing list archive at

Lance Norskog

View raw message