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From Vikram Kone <vikramk...@gmail.com>
Subject Re: How to run any application on Cassandra cluster in high availability mode
Date Tue, 18 Aug 2015 18:45:06 GMT
Hi John,
I have posted the same Q on azkaban google group but there is no response
so far :(
If i want to do the old school way of monitor, alert and start the process
somewhere else..how can I do this? Are there some ready made tools to do
this kind of general purpose monitoring and alerting for services on linux?

On Sun, Aug 16, 2015 at 9:38 AM, Prem Yadav <ipremyadav@gmail.com> wrote:

> The MySQL is there just to save the state of things. I suppose it very
> lightweight. Why not just install mysql on one of the nodes or a VM
> somewhere.
>
>
> On Sun, Aug 16, 2015 at 3:39 PM, John Wong <gokoproject@gmail.com> wrote:
>
>> Sorry i meant integration with Cassandra (based on the docs by default it
>> suggests MySQL)
>>
>>
>> On Sunday, August 16, 2015, John Wong <gokoproject@gmail.com> wrote:
>>
>>> There is no leader in cassandra. I suggest you ask Azkaban community
>>> about intgteation with Azkaban and Azkaban HA.
>>>
>>> On Sunday, August 16, 2015, Vikram Kone <vikramkone@gmail.com> wrote:
>>>
>>>> Can't we use zoo keeper for leader election in Cassandra and based on
>>>> who is leader ..run azkaban or any app instance for that matter on that
>>>> Cassandra server. I'm thinking that I can copy the applocation folder to
>>>> all nodes and then determine which one to run using zookeeper. Is that
>>>> possible ?
>>>>
>>>> Sent from Outlook <http://aka.ms/Ox5hz3>
>>>>
>>>>
>>>>
>>>>
>>>> On Sun, Aug 16, 2015 at 6:47 AM -0700, "John Wong" <
>>>> gokoproject@gmail.com> wrote:
>>>>
>>>> Hi
>>>>>
>>>>> I am not familiar with Azkaban and probably a better question to the
>>>>> Azkaban community IMO. But there seems to be two modes (
>>>>> http://azkaban.github.io/azkaban/docs/2.5/) one is solo and one is
>>>>> two-server mode, but either way I think still SPOF? If there is no
>>>>> election, just based on process, my 2 cents would be monitor, alert,
and
>>>>> start the process somewhere else. Better yet, don't install the process
on
>>>>> Cassandra node. Keep your instance for one purpose only. If you run cloud
>>>>> like AWS you will be able to autoscale min1 max1 easily.
>>>>>
>>>>>
>>>>> Note: In peer-to-peer architecture, there is simply no concept of
>>>>> master. You can start with some seed nodes for discovery. It depends
how
>>>>> you design discovery.
>>>>>
>>>>> On Sat, Aug 15, 2015 at 11:49 AM, Vikram Kone <vikramkone@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi,
>>>>>> We are planning to install Azkaban in solo server mode on a 24
>>>>>> node cassandra cluster to be able to schedule spark jobs with intricate
>>>>>> dependency chain. The problem, is since Cassandra has a no-SPOF
>>>>>> architecture ie any node can become the master for the cluster, it
creates
>>>>>> the problem for Azkaban master since it's not a peer-peer architecture
>>>>>> where any node can become the master. Only a single mode has to be
master
>>>>>> at any given time.
>>>>>>
>>>>>> What are our options here? Are there any framworks or tools out there
>>>>>> that would allow any application to run on a cluster of machines
with high
>>>>>> availablity?
>>>>>> Should I be looking at something like zookeeper for this ? Or Mesos
>>>>>> may be?
>>>>>
>>>>>
>>>>>
>>>
>>> --
>>> Sent from Jeff Dean's printf() mobile console
>>>
>>
>>
>> --
>> Sent from Jeff Dean's printf() mobile console
>>
>
>

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