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From Michał Łowicki <>
Subject Increase compaction performance
Date Thu, 11 Feb 2016 15:55:05 GMT

Using 2.1.12 across 3 DCs. Each DC has 8 nodes. Trying to run repair using
Cassandra Reaper but nodes after couple of hours are full of pending
compaction tasks (regular not the ones about validation)

CPU load is fine, SSD disks below 30% utilization, no long GC pauses.

How to speed up compaction? Increased compaction throughput and concurrent
compactors but no change. Seems there is plenty idle resources but can't
force C* to use it.

Any clue where there might be a bottleneck?

Michał Łowicki

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