Ariel Weisberg created CASSANDRA-19596:
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Summary: IntervalTree build throughput is low enough to be a
bottleneck
Key: CASSANDRA-19596
URL: https://issues.apache.org/jira/browse/CASSANDRA-19596
Project: Cassandra
Issue Type: Improvement
Components: Local/Compaction, Local/SSTable
Reporter: Ariel Weisberg
With several terabytes of data and 8 compactors it’s possible for the
compactors to spend a lot of time blocked waiting on IntervalTrees to be built.
There is also a lot of wasted CPU because it’s updated optimistically so most
of them end up being thrown away.
This can end up being quite painful because it can block memtable flushing as
well and then a single slow CFS can block unrelated CFS because the memtable
post flush executor is single threaded and shared across all CFS.
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