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From Ali Ahsan <ali.ah...@panasiangroup.com>
Subject Question regarding Compaction
Date Tue, 17 May 2011 18:30:00 GMT
Hi All,

I was  diagnosing  high  CPU usage on my Cassandra 0.6.3.Then i came 
across  Cassandra wiki link which suggested following.


"

To lower compaction priority (thus reducing its impact on the rest of 
the system, and making it take longer), add these options to 
cassandra.in.sh in 0.6.3 or later:

-XX:+UseThreadPriorities \
-XX:ThreadPriorityPolicy=42 \
-Dcassandra.compaction.priority=1 \

"

http://wiki.apache.org/cassandra/PerformanceTuning


After adding above in my cassandra.in.sh my high CPU usage seems to 
dropped very very low in fact it seem nothing is running on machine's.

So here is my question do i need to run nodetool compact or not and what 
about noretool rapier.

-- 
S.Ali Ahsan




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