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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: how does compaction_throughput_kb_per_sec affect disk io?
Date Mon, 26 Sep 2011 14:38:52 GMT
compaction throughput doesn't affect flushing or reads

On Mon, Sep 26, 2011 at 7:40 AM, Yan Chunlu <springrider@gmail.com> wrote:
> I am using the default 16MB when running repair. but the disk io is still
> quite high:
> Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz
> avgqu-sz   await r_await w_await  svctm  %util
> sdb             136.00     0.00  506.00   26.00 63430.00  5880.00   260.56
> 101.73  224.38    6.60 4462.62   1.88 100.00
> Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz
> avgqu-sz   await r_await w_await  svctm  %util
> sdb              58.50 21978.00  131.00  122.50 16226.00 52596.00   542.97
> 122.98  870.28   10.02 1790.24   3.94 100.00
>
>
>
> the  rkB/s  and wKB/s are almost 60MB, did I misunderstand the meaning of
> compaction throttle?
>
> cassandra version is 0.8.6



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

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