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From "Steve Harris" <>
Subject Re: Clustering Lucene with 40 Servers
Date Wed, 27 Dec 2006 18:46:47 GMT
Some quick questions/points:

What is the update rate?

The number of nodes you described is no problem, the query rate would be
no problem too (because they use read locks and act independently).

Do all nodes do updates or just 1? How often do these updates occur?

Probably best thing to do is give it a try and run a few tests.


On 12/27/06, Biggy <> wrote:
> I'm currently investigating the best ways of clustering Lucene.
> I've heard of both Solr, Terracotta but do not know how well they scale.
> Their examples talk of a 4 node cluster. This is way too small for my needs.
> I have 30x JVMs each handling 3 requests/sec and each having their own
> Lucene index. The index changes are propagated to the cluster members using
> JGroups messages. This solution has more than reached its limit as JGroups
> has become unstable and a source of many JVMs crashes. Based on current
> traffic trends I anticipate needing to upgrade to 40x + JVMS very soon.
> Can anybody suggest a way to effectivily cluster / replicate document
> changes ?
> P.S.:
> JMS is not a possible solution as this was the prior JGroups solution. We
> had too many memory problems/queue full etc crashing the servers thereafter.
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