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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: boonfilters
Date Wed, 07 Apr 2010 20:37:05 GMT
2010/4/7 Peter Schüller <scode@spotify.com>:
> Someone correct me if I'm wrong, but my understanding is that the
> bloom filters are only used to optimize the case of a key being
> non-existent, such that you only have to go down on disk for a very
> small number of requests for non-existent keys. I do not believe bloom
> filters have any interaction with replication. The reason to use a
> bloom filter is that it trades great memory efficiency for the
> possibility of false positives.

We also use row-level bloom filters when you request columns by name
(as opposed to by slice).

-Jonathan

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