incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Yan Chunlu <springri...@gmail.com>
Subject Re: how does compaction_throughput_kb_per_sec affect disk io?
Date Tue, 27 Sep 2011 05:27:27 GMT
okay, thanks!

On Mon, Sep 26, 2011 at 10:38 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> 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
>

Mime
View raw message