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Type:
New Feature
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Status: Resolved
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Priority:
Low
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Resolution: Later
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Fix Version/s: None
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Component/s: Local/Compaction
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Labels:
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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