Vijay created CASSANDRA-6544:
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Summary: Reduce GC activity during compaction
Key: CASSANDRA-6544
URL: https://issues.apache.org/jira/browse/CASSANDRA-6544
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Vijay
Assignee: Vijay
Fix For: 2.1
We are noticing increase in P99 while the compactions are running at full
stream. Most of it is because of the increased GC activity (followed by full
GC).
The obvious solution/work around is to throttle the compactions, but with SSD's
we can get more disk bandwidth for reads and compactions.
It will be nice to move the compaction object allocations off heap. First thing
to do might be create a Offheap Slab allocator with the size as the compaction
in memory size and recycle it.
Also we might want to make it configurable so folks can disable it when they
don't have off-heap memory to reserve.
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