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From kevin <kevincastigli...@gmail.com>
Subject Re: reads are slow
Date Tue, 23 Feb 2010 18:01:38 GMT
yes there is a lot more than 100. there are  around 50,000 to 100000
columns.

is there any solution for this?

from the issue 598 page, i can have only 1000s of columns in a super column?

On Tue, Feb 23, 2010 at 9:47 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> how many columns total are in the supercolumn?
>
> if it's a lot more than 100 you are running into
> http://issues.apache.org/jira/browse/CASSANDRA-598
>
> On Tue, Feb 23, 2010 at 11:44 AM, kevin <kevincastiglione@gmail.com>
> wrote:
> > i dont think so
> > /dev/sdc1 is the commitlog drive, and /dev/sdd1 is the data directory.
> >
> > http://pastie.org/838943
> >
> >
> > On Tue, Feb 23, 2010 at 9:35 AM, Jonathan Ellis <jbellis@gmail.com>
> wrote:
> >>
> >> are you i/o bound?
> >> http://spyced.blogspot.com/2010/01/linux-performance-basics.html
> >>
> >> On Tue, Feb 23, 2010 at 11:33 AM, kevin <kevincastiglione@gmail.com>
> >> wrote:
> >> > to load 100 columns of a super column it takes over a second. how to
> >> > improve
> >> > this performance.
> >> >
> >> >
> >> > i am using cassandra 0.5 version.
> >> >
> >> > output of nodeprobe info
> >> > 29814395632524962303611017038378268216
> >> > Load             : 9.18 GB
> >> > Generation No    : 1266945238
> >> > Uptime (seconds) : 638131
> >> > Heap Memory (MB) : 47.55 / 10237.94
> >> >
> >> > the full config file is here
> >> > http://pastie.org/838916
> >> >
> >> > I have given 10GB RAM in cassandra.in.sh.
> >> >         -Xmx10G \
> >> > i have increased KeysCachedFraction to 0.04. i have two different
> drives
> >> > for
> >> > commitlog and data directoy.
> >> > i have about 3 million rows.
> >> > what can i do to improve read speed?
> >> > thanks a lot!
> >> >
> >
> >
>

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