Tuning a Riak cluster.

Richard Shaw richard at basho.com
Sat Feb 23 03:35:51 EST 2013


Hi Kevin,

I sympathise with R, i'm going to write an installation guide to go on the
site.

In regards to the error, please paste in the contents of you vm.args file
from the target node

Thanks

Richard


On Fri, Feb 22, 2013 at 11:05 PM, <rkevinburton at charter.net> wrote:

> Here is the output from one configuration try:
>
> 17:00:08.878 [info] Using http target "172.16.33.138":8098 for worker 2
>
> 17:00:08.878 [info] Using pb target "172.16.33.138":8087 for worker 2
>
> 17:00:08.993 [debug] Supervisor basho_bench_sup started
> basho_bench_worker:start_link(basho_bench_worker_2, 2) at pid <0.96.0>
>
> 17:00:08.999 [info] Using http target "172.16.33.107":8098 for worker 3
>
> 17:00:09.001 [info] Using pb target "172.16.33.107":8087 for worker 3
>
> 17:00:09.006 [debug] Supervisor basho_bench_sup started
> basho_bench_worker:start_link(basho_bench_worker_3, 3) at pid <0.99.0>
>
> 17:00:09.022 [debug] Supervisor net_sup started erl_epmd:start_link() at
> pid <0.104.0>
>
> 17:00:09.029 [debug] Supervisor net_sup started auth:start_link() at pid
> <0.105.0>
>
> 17:00:09.030 [info] Can't set long node name!
> Please check your configuration
>
>
> 17:00:09.030 [error] Failed to start net_kernel for
> basho_bench_measurement_erlangvm:
> {shutdown,{child,undefined,net_sup_dynamic,{erl_distribution,start_link,[[basho_bench,longnames]]},permanent,1000,supervisor,[erl_distribution]}}
>
>
> There is alot more output but this is the tail end of the output.
>
>
> On Fri, Feb 22, 2013 at 4:34 PM, Richard Shaw wrote:
>
>  Hi Kevin,
>
> Always good practise to reply to the mailing list so others can benefit
> from the content
>
>
> basho bench is the best place to start, If you have a working cluster or
> even a working single node, follow the benchmarking guide[0]
>
>
> Please let me see some of the specific errors you're having and we can
> help resolve them.
>
>
> Outside of basho bench, I recommend benchmarking the raw performance of
> your VM, you can do this using a variety of tools like iostat, iperf or a
> test suite like Phoronix test suite, a very comprehensive FOSS tool[1] look
> at the `aio` test
>
>
> I'd also recommend benchmarking each time you make a configuration change
> to really understand how effective that change was
>
>
> [0] *http://docs.basho.com/riak/latest/cookbooks/Benchmarking/*<http://docs.basho.com/riak/latest/cookbooks/Benchmarking/><http://docs.basho.com/riak/latest/cookbooks/Benchmarking/>
> [1] *http://www.phoronix-test-suite.com/*<http://www.phoronix-test-suite.com/><http://www.phoronix-test-suite.com/>
>
> <http://www.phoronix-test-suite.com/>
> Kind Regards <http://www.phoronix-test-suite.com/>
>
> <http://www.phoronix-test-suite.com/>
> Richard <http://www.phoronix-test-suite.com/>
>
>
> On Fri, Feb 22, 2013 at 10:14 PM, Kevin Burton < *rkevinburton at charter.net
> *> wrote:
> That was my next question. I have tried to get basho_bench to work but so
> far have been unsuccessful. If you have a simple "hello world" sample
> config I would greatly appreciate it. I have tried a bunch of configs in
> the examples directory but get met with one error or another.
> Other than that I have just timed various client driver calls. Mostly
> random reads some writes.
>
> On Feb 22, 2013, at 3:48 PM, Richard Shaw < *richard at basho.com*> wrote:
>
> Hi Kevin,
> What kind of benchmarking have you done on your VMs and what did you use ?
>
> Kind Regards
>
> Richard
>
>
> On Fri, Feb 22, 2013 at 9:49 AM, Kevin Burton < *rkevinburton at charter.net*>
> wrote:
> Ok I suspected as much. This will give me more ammo when requesting more
> resources. Thank you.
> Now, back to the original question. Given that the physical hardware is
> taken care of. What parameters are most important when tuning a cluster.
> Again for arguments sake assume the same 4 node cluster with a read-write
> ratio of about 75 percent.
>
> On Feb 21, 2013, at 8:26 PM, Alexander Sicular < *siculars at gmail.com*>
> wrote:
>
> It can't be said enough times but the number one thing you can do to
> ensure that you are getting true performance (not to mention redundancy) is
> to use different physical hardware for each of your nodes. Under no
> circumstances should you have more than one VM (one logical node in a Riak
> cluster) on the same physical hardware. Also, use multiple
> connections/threads/parallelism/whatever on client side and be sure to hit
> all the nodes in the cluster haproxy roundrobin-esque when writing to Riak.
> Everything else is in the noise.
>
> -Alexander Sicular
>
> @siculars
>
> On Feb 21, 2013, at 9:04 PM, Kevin Burton < *rkevinburton at charter.net*>
> wrote:
>
>
> There each has about 20-30GB of disk space.  They each are a VM so I am
> not sure how to specify the CPU. They all seem to be 64 bit Intel
> processors but I could tell you the clock speed. The network is 1Gb
> Ethernet.
>
> *From: *  Sean Carey [mailto: *carey@**basho.com* <http://basho.com>]
> *Sent: *  Thursday, February 21, 2013 7:59 PM
> *To: *  Kevin Burton
> *Cc: *  *riak-users at lists.basho.com*
> *Subject: *  Re: Tuning a Riak cluster.
>
> Kevin,
> Disk and CPU, and Network?
>
>
> Sean Carey
> @densone
> On Thursday, February 21, 2013 at 20:31, Kevin Burton wrote:
>
> I have a cluster of 4 machines (4 Linux VM machines each allocated about 1
> Gb of memory – yea I know it isn’t a lot). I would like to get some
> pointers on getting the fastest query time possible given these meager
> resources. Thank you.
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