Jonathan Ellis created CASSANDRA-9830:
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Summary: Option to disable bloom filter in highest level of LCS
sstables
Key: CASSANDRA-9830
URL: https://issues.apache.org/jira/browse/CASSANDRA-9830
Project: Cassandra
Issue Type: New Feature
Components: Core
Reporter: Jonathan Ellis
Assignee: Paulo Motta
Priority: Minor
Fix For: 3.x
We expect about 90% of data to be in the highest level of LCS in a fully
populated series. (See also CASSANDRA-9829.)
Thus if the user is primarily asking for data (partitions) that has actually
been inserted, the bloom filter on the highest level only helps reject sstables
about 10% of the time.
We should add an option that suppresses bloom filter creation on top-level
sstables. This will dramatically reduce memory usage for LCS and may even
improve performance as we no longer check a low-value filter.
(This is also an idea from RocksDB.)
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