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From vineet daniel <vineetdan...@gmail.com>
Subject Re: How do you, Bloom filter of the false positive rate or remove the problem of distributed databases?
Date Tue, 04 May 2010 09:01:27 GMT
Only major compactions can clean out obsolete tombstones.

On Tue, May 4, 2010 at 9:59 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> On Mon, May 3, 2010 at 8:45 PM, Kauzki Aranami <kazuki.aranami@gmail.com>
> wrote:
> > Let me rephrase my question.
> >
> > How does Cassandra deal with bloom filter's false positives on deleted
> records?
>
> The same way it deals with tombstones that it encounters otherwise
> (part of a row slice, or in a memtable).
>
> All the bloom filter does is keep you from having to check rows that
> don't have any data at all for a given key.  Tombstones are not the
> same as "no data at all," we do need to propagate tombstones during
> replication.
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>

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