LeveledCompaction has several performance problems
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Key: CASSANDRA-3234
URL: https://issues.apache.org/jira/browse/CASSANDRA-3234
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 1.0.0
Reporter: Jonathan Ellis
Assignee: Jonathan Ellis
Fix For: 1.0.0
Two main problems:
- BF size calculation doesn't take into account LCS breaking the output apart
into "bite sized" sstables, so memory use is much higher than predicted
- ManyToMany merging is slow. At least part of this is from running the full
reducer machinery against single input sources, which can be optimized away.
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