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From Peter Miller <>
Subject How best to handle a reasonable amount to data (25TB+)
Date Mon, 06 Feb 2012 02:50:43 GMT

I have a little bit of an unusual set of requirements, and I am looking for advice. I have
researched the archives, and seen some relevant posts, but they are fairly old and not specifically
a match, so I thought I would give this a try.

We will eventually have about 50TB raw, non-searchable data and 25TB of search attributes
to handle in Lucene, across about 1.25 trillion documents. The app is write once, read many.
There are many document types involved that have to be able to be searched separately or together,
with some common attributes, but also unique ones per type. I plan on using a JCP implementation
that uses Lucene under the covers. The data itself is not searchable, only the attributes.
I plan to hook the JCP repo (ModeShape) up to the OpenStack Object Storage on commodity hardware
eventually with 5 machines, each with 24 x 2TB drives. This should allow for redundancy (3
copies), although I would suppose we would add bigger drives as we go on.

Since there is such a lot of data to index (not outrageous amounts for these days, but a bit
chunky), I was sort of assuming that the Lucene indexes would go on the object storage solution
too, to handle availability and other infrastructure issues. Most of the searches would be
date-constrained, so I thought that the indexes could be sharded by date.

There would be a local disk index being built near real time on the JCP hardware that could
be regularly merged in with the main indexes on the object storage, I suppose.

Does that make sense, and would it work? Sorry, but this is just theoretical at the moment
and I'm not experienced in Lucene, as you can no doubt tell.

I came across a piece that was talking about Hardoop and distributed Solr,,
and I'm now wondering if that would be a superior approach? Or any other suggestions?

Many Thanks,
The Captn

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