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From Weijun Li <>
Subject BloomFilter is taking too much memory
Date Tue, 04 May 2010 20:47:03 GMT

We stored about 47mil keys in one Cassandra node and what a memory dump
shows for one of the SStableReader:

    SSTableReader: 386MB. Among this 386MB, IndexSummary takes about 231MB
but BloomFilter takes 155MB with an embedded huge array long[19.4mil].

It seems that BloomFilter is taking too much memory. If this is the case
BloomFilter seems to be redundant comparing to the size of index.

So is this desired behavior? Is there a formula to estimate the size of
needed memory for BloomFilter?



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