I'm building a distributed index (mostly as a reasearch project for
school) and I'm evaluating indexing the entire collection in memory
(like google, facebook and others have done years ago). The obvious
reason for this is performance considering that the replication will
give me a reasonably good durability of the data (despite being in
volatile memory).

What is the current status of Lucene for this kind of indexes?
RAMDirectory in it's documentation has a scary warning that says that
"is not intended to work with huge indexes", and that sounds more like
it is an implementation for testing rather than something for
production.

Of course there is no real context for this question, because it is a
reasearch topic. Testing it's limits would be the closest to a context
I have :p

Thanks
Emmanuel

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