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From Anand Somani <meatfor...@gmail.com>
Subject Re: Linear scalability problems
Date Thu, 04 Apr 2013 19:05:36 GMT
RF=3.

On Thu, Apr 4, 2013 at 7:08 AM, Cem Cayiroglu <cayiroglu@gmail.com> wrote:

> What was the RF before adding nodes?
>
> Sent from my iPhone
>
> On 04 Apr 2013, at 15:12, Anand Somani <meatforums@gmail.com> wrote:
>
> 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/>
>>
>
>

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