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From Chitra Raveendran <chitra.raveend...@flutura.com>
Subject Re: Deactivate topology incase of network issues!!!
Date Mon, 10 Feb 2014 11:14:04 GMT
Thank you Enno !!

I'm going to test out with 5K and see check the performance! Thanks again


On Mon, Feb 10, 2014 at 4:32 PM, Enno Shioji <enno.shioji@peerindex.com>wrote:

> > What would be an appropriate value for TOPOLOGY_MAX_SPOUT_PENDING so
> that it would not slow down or affect the present performance (any rough
> figure) ? There is no default value for this parameter right?
>
> That's a hard question as it depends on your cluster's resource and your
> processing... Having said that though, if I had no idea on both
> parameters I'd go for something like 5K or 10K and go from there (unless
> you are doing something special like producing large number of child tuples
> off a parent tuple etc).
>
> Others on this list might be able to give you a better suggestion.
>
>
>
>
>
>
> On Mon, Feb 10, 2014 at 10:34 AM, Chitra Raveendran <
> chitra.raveendran@flutura.com> wrote:
>
>> Hi
>>
>> Yeah thanks for that suggestion, killing the process was not exactly what
>> I had in mind, But just wanted to test that option too, as the whole
>> cluster was affected this weekend.
>>
>> What would be an appropriate value for TOPOLOGY_MAX_SPOUT_PENDING so
>> that it would not slow down or affect the present performance (any rough
>> figure) ? There is no default value for this parameter right?
>>
>>
>>
>>
>>
>> On Mon, Feb 10, 2014 at 3:47 PM, Enno Shioji <enno.shioji@peerindex.com>wrote:
>>
>>> T.b.h. killing your topology on a single SQL exception is prob. a bad
>>> idea, they can happen time to time and you don't want to kill your system
>>> because of that.
>>>
>>> I might look at setting TOPOLOGY_MAX_SPOUT_PENDING to some manageable
>>> number so that you won't have large numbers of tuples flying in your system
>>> and thus slashing your cluster's performance. That way when MySQL comes
>>> back up, the topology can resume processing. IMO that's much preferable.
>>>
>>>
>>> On Mon, Feb 10, 2014 at 9:53 AM, Chitra Raveendran <
>>> chitra.raveendran@flutura.com> wrote:
>>>
>>>> Thanks a lot Bijoy
>>>>
>>>> I will test that out and get back to you.
>>>>
>>>> Regards
>>>> Chitra
>>>>
>>>>
>>>> On Mon, Feb 10, 2014 at 2:14 PM, bijoy deb <bijoy.computers@gmail.com>wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> You can catch the exception in your bolt (which is connecting to sql
>>>>> server) and in the catch block you can kill or deactivate the topology
>>>>> using Nimbus client,as below:
>>>>>
>>>>> NimbusClient client = .......
>>>>>
>>>>> client.killTopology(
>>>>> "topologyName");//or, client.deactivate("topologyName");
>>>>>
>>>>>
>>>>>
>>>>> Thanks
>>>>>
>>>>> Bijoy
>>>>>
>>>>>
>>>>> On Mon, Feb 10, 2014 at 1:42 PM, Chitra Raveendran <
>>>>> chitra.raveendran@flutura.com> wrote:
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> I have a Realtime data crunching pipeline which wherein storm
>>>>>> consumes data from kafka, we do some processing on this data (basically
>>>>>> counts and aggregations) and store the results into a MySql database.(
I
>>>>>> use the default Kafka spout.)
>>>>>>
>>>>>> Over the weekend some network related issues led to MySQL server
>>>>>> crash, as a result storm kept re-sending the messages, the processing
in
>>>>>> the storm supervisors increased drastically and CPU usage hit 100%.
This in
>>>>>> turn led to some supervisors falling out of the cluster and trying
to
>>>>>> restart.
>>>>>>
>>>>>> How would I be able to *handle* such an unforeseen situation? Is
>>>>>> there any way through which storm would understand that there is
a MySql
>>>>>> server issue and stop re-sending data?
>>>>>>
>>>>>> Is there anyway that this exception can be caught and in *topology
>>>>>> be deactivated* for a while?
>>>>>>
>>>>>> Regards,
>>>>>> Chitra
>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>>
>> Regards,
>>
>> *Chitra Raveendran*
>> *Data Scientist*
>> Mobile: +91 819753660│*Email:* chitra.raveendran@flutura.com
>> *Flutura Business Solutions Private Limited – “A Decision Sciences &
>> Analytics Company”*│ #693, 2nd Floor, Geetanjali, 15th Cross, J.P Nagar 2
>> nd Phase, Bangalore – 560078│
>>
>>
>>
>

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