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From Benjamin Black...@b3k.us>
Subject Re: Cassandra Horizontal Scalability
Date Tue, 27 Jul 2010 01:15:07 GMT
Are you persisting connections or opening a new one for each operation?

Do you understand what deletes actually do internally?

On Mon, Jul 26, 2010 at 12:45 PM, SSam <to_sam007@yahoo.com> wrote:
> Thanks for reply
>
> I am doing very simple test:
> I am stressing my webapplication with grinder  testing tool.
> Number of testing clients is 250, each client just creates/deletes a User
> Object( max 500 bytes data).  So data is purely WRITE ( I hope Cassandra is
> Write Optimized) .
> I am running -0.6.3 version,  no errors  either on cassandra server logs or
> my web application server logs.
> I have JUST changed listing address and port from default storage-conf.xml
> Here is ColumnFamily Defination.
> <ColumnFamily Name="Users" CompareWith="UTF8Type"/>
>
> Anyway I will do testing directly over cassandra bypassing web application.
> I will update the forum with my testing results.
>
>
> ________________________________
> From: Bill de hÓra <bill@dehora.net>
> To: user@cassandra.apache.org
> Sent: Mon, July 26, 2010 3:23:38 PM
> Subject: Re: Cassandra Horizontal Scalability
>
> Initially, try running stress.py against your servers. That will help
> eliminate pelops as the issue.
>
> Also, some more detail on your setup wouldn't hurt, 1300 anything a
> second is low.
>
> Is the TPS reads or writes, or a mix?
>
> What's the column family structure?
>
> Is the data large (eg are you writing binary files)?
>
> How many client processes are you running?
>
> What are the server configurations?
>
> How much data are nodes carrying?
>
> What does the output of ./nodetool cfstats say?
>
> What version of cassandra are you running?
>
> Are there errors in the server logs?
>
> Bill
>
> On Mon, 2010-07-26 at 09:26 -0700, SSam wrote:
>>
>> I have fully separated gigabit  private subnet.
>> I am using  pelops cassandra java client with 150 client pool.
>
>>
>>
>>
>> ______________________________________________________________________
>> From: Paul Prescod <paul@prescod.net>
>> To: user@cassandra.apache.org
>> Sent: Mon, July 26, 2010 12:21:06 PM
>> Subject: Re: Cassandra Horizontal Scalability
>>
>> There are a lot of variables that go into a proper benchmark. The
>> bottleneck could be in many different places.
>>
>>
>> How many client threads are you using? What kind of network?
>>
>> On Mon, Jul 26, 2010 at 8:29 AM, SSam <to_sam007@yahoo.com> wrote:
>>
>>        From Cassandra Website:
>>              * Elastic
>>
>>                Read and write throughput both increase linearly as
>>                new machines are added, with no downtime or
>>                interruption to applications.
>>
>>
>>        I am testing TPS with Cassandra cluster.
>>        Initially I have tested with one node cluster , got 1300
>>        TPS,
>>        added another node and I got 1200 TPS with 2 node cluster.
>>        TPS supposed to increase  with every additional node.  I am
>>        not sure what I am doing wrong?  Any suggestions on Cassandra
>>        Scalability?
>>
>>        Thanks,
>>        Sam.
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>

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