[rabbitmq-discuss] Rabbitmq cluster design and HA

[srikanth tns]

Also , we are trying to use 2DISC 1RAM in the cluster . Is this good enough
? Also which node should be set as RAM , is there any preference to set
only a particular node the cluster to be RAM ?

Thanks
Srikanth


On Wed, Apr 30, 2014 at 1:48 PM, srikanth tns <srikanthtns at gmail.com> wrote:

> Thanks Micheal , here is the settings we are doing on rabbitmq cluster
>
> {rabbit, [{vm_memory_high_watermark_paging_ratio,
> 0.8},{vm_memory_high_watermark, 0.9},{disk_free_limit, 1000000000}]}
>
> Apart from this ,is there any QoS value that we need to set ?
>
>
> On Tue, Apr 29, 2014 at 1:13 AM, Michael Klishin <mklishin at gopivotal.com>wrote:
>
>>
>>
>> On 29 April 2014 at 07:22:03, srikanth tns (srikanthtns at gmail.com) wrote:
>> > > Can you let us know what would be optimal settings on rabbitmq
>> > cluster to prevent it from crashing and having reliable messaging?
>>
>> It's really hard to make general recommendations without knowing what
>> kind of workload you use.
>>
>> > 1) sysctl configurations
>>
>> nlimit > 20,000 or so (definitely can't be less than ~ 6K)
>>
>> > 2) Disk limitations to setup on cluster . the default is 50MB
>>
>> I'd use 500 MB or so if RabbitMQ is the primary thing that runs on the
>> machine.
>>
>> > 3) Memory to used , right now its default 40%
>>
>> Can be up to 90%, again, depending on what else may run on the same
>> machine.
>>
>>
>> > 6) any disk space limitation on the hosts
>>
>> Host is this different from 2) above?
>>
>> > For HA , we are using ha-mode all to duplicate the queues across
>> > all nodes in the cluster. Do you think its reliable during the
>> > failover scenario ?During the failover it would like 100k queues
>> > on nthe new master? Or should we use ha-mode = exactly/nodes ?
>>
>> With 3 nodes ha-mode=all is a reasonable amount of duplication. If you
>> are confident
>> you will never lose more than 1 node at a time, use ha-mode=exactly with
>> 2 nodes.
>> Less duplication means better throughput.
>>
>> As to how well new master election will work with 100K queues, try it.
>> --
>> MK
>>
>> Software Engineer, Pivotal/RabbitMQ
>>
>
>
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