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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: reads are slow
Date Tue, 23 Feb 2010 17:47:03 GMT
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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