I would be interested in seeing how you maintained replicated indices that r in sync. The way we did was, run the indexer on each server independently. I the data changes, one server will know the change. That server updates lucene index and notifies other servers (using multicast).
Glad to know someone else is doing the similar thing and more happy to know that the solution works even for 100 millions documents. I was little worried if the index size goes higher and higher but it looks like we should not have to worry anymore :)
Thanks
Praveen
----- Original Message ----- From: "Bryan McCormick" <[EMAIL PROTECTED]>
To: "Chris D" <[EMAIL PROTECTED]>
Cc: <lucene-user@jakarta.apache.org>
Sent: Friday, February 18, 2005 3:45 PM
Subject: Re: Scalability of Lucene indexes
Hi chris,
I'm responsible for the webshots.com search index and we've had very good results with lucene. It currently indexes over 100 Million documents and performs 4 Million searches / day.
We initially tested running multiple small copies and using a MultiSearcher and then merging results as compared to running a very large single index. We actually found that the single large instance performed better. To improve load handling we clustered multiple identical copies together, then session bind a user to particular server and cache the results, but each server is running a single index.
Bryan McCormick
On Fri, 2005-02-18 at 08:01, Chris D wrote:Hi all,
I have a question about scaling lucene across a cluster, and good ways of breaking up the work.
We have a very large index and searches sometimes take more time than they're allowed. What we have been doing is during indexing we index into 256 seperate indexes (depending on the md5sum) then distribute the indexes to the search machines. So if a machine has 128 indexes it would have to do 128 searches. I gave parallelMultiSearcher a try and it was significantly slower than simply iterating through the indexes one at a time.
Our new plan is to somehow have only one index per search machine and a larger main index stored on the master.
What I'm interested to know is whether having one extremely large index for the master then splitting the index into several smaller indexes (if this is possible) would be better than having several smaller indexes and merging them on the search machines into one index.
I would also be interested to know how others have divided up search work across a cluster.
Thanks, Chris
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