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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Question regarding Compaction
Date Tue, 17 May 2011 18:57:46 GMT
You've had people on this list tell you you should upgrade off such an
old release at least twice already this month.

The reason we do this is, the odds are good that the answer is
"someone else ran into that problem a year ago and it got fixed."
Personally, I don't think it's worth the time to troubleshoot before
upgrading.

Re compaction and repair, you can read up on both at
http://www.datastax.com/docs/0.8/operations/scheduled_tasks.

On Tue, May 17, 2011 at 1:30 PM, Ali Ahsan <ali.ahsan@panasiangroup.com> wrote:
> 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
>
>
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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