incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Anand Somani <meatfor...@gmail.com>
Subject Re: Linear scalability problems
Date Thu, 04 Apr 2013 13:12:06 GMT
We are using a single process with multiple threads, will look at client
side delays.

Thanks

On Wed, Apr 3, 2013 at 9:30 AM, Tyler Hobbs <tyler@datastax.com> wrote:

> If I had to guess, I would say that your client is the bottleneck, not the
> cluster.  Are you inserting data with multiple threads or processes?
>
>
> On Wed, Apr 3, 2013 at 8:49 AM, Anand Somani <meatforums@gmail.com> wrote:
>
>> Hi,
>>
>> I am running some tests trying to scale out our application from using a
>> 3 node cluster to 6 node cluster. The thing I observed is that when using a
>> 3 node cluster I was able to handle abt 41 req/second, so I added 3 more
>> nodes thinking it should close to double, but instead it only goes upto bat
>> 47 req/second!! I am doing something wrong and it is not obvious, so wanted
>> some help in what stats could/should I monitor to tell me things like if a
>> node has more requests or if the load distribution is not random enough?
>>
>> Note I am using direct thrift (old code base) and cassandra 1.1.6. The
>> data model is for storing blobs (split across columns) and has around 6 CF,
>> RF=3 and all operations are at quorum. Also at the end of the run nodetool
>> ring reports the same data size.
>>
>> Thanks
>> Anand
>>
>
>
>
> --
> Tyler Hobbs
> DataStax <http://datastax.com/>
>

Mime
View raw message