Kannel HTTP MO delivery failing under load

[Giulio Harding]

Alexander Malysh wrote:
> It's a bug in smsbox that it didn't limit max allowed http connections. 
> The same bug is present in HTTP SMSC module. HTTP was fixed by me as I 
> was at Centrium/Wapme but unfortunately I didn't merged it and don't 
> have modifications anymore but it was really simple to fix. I will try 
> to provide patch this/next week.

That would be great! Once this issue is resolved, Kannel will 
effectively be working 'perfectly' for us :)

> as for the fact that MO messages are not retransmitted in smsbox: did 
> you enable retry in smsbox?

As per the config I attached to my original email, http-request-retry 
was set to 0, so no - the smsbox wasn't set to retry.

However, when I re-ran the test with http-request-retry = 10, I didn't 
see any difference in behaviour - the log messages were the same 
(indicating that http requests failed because of too many open files), 
and I didn't see any indication that a retry was being attempted. The 
Kannel docs seem to suggest that setting that parameter to a non-zero 
value is all that's required to enable retransmits - am I missing 
something else?

> Thanks,
> Alex
> 
> Am 03.08.2006, 09:25 Uhr, schrieb Giulio Harding 
> <giulio.harding at mnetcorporation.com>:
> 
>> Hillel wrote:
>>> Hi,
>>>  Are you using as a OpenSMPP SMSC simulator the 
>>> http://opensmpp.logica.com/
>>> or as another version?
>>>  Please email back the version you are using, so others can confirm your
>>> results.
>>>  Rgds
>>
>> Sorry, it turns out the version of OpenSMPP we're using has been 
>> heavily modified from the original - however, I have been able to 
>> reproduce the problem using the latest version of SMPPSim, with the 
>> following configuration options (modified only slightly from the stock 
>> configuration):
>>
>> SMPP_PORT=7011
>> SMPP_CONNECTION_HANDLERS=2
>>
>> CONNECTION_HANDLER_CLASS=com.seleniumsoftware.SMPPSim.StandardConnectionHandler 
>>
>> PROTOCOL_HANDLER_CLASS=com.seleniumsoftware.SMPPSim.StandardProtocolHandler 
>>
>>
>> LIFE_CYCLE_MANAGER=com.seleniumsoftware.SMPPSim.LifeCycleManager
>>
>> MESSAGE_STATE_CHECK_FREQUENCY=5000
>>
>> MAX_TIME_ENROUTE=10000
>>
>> PERCENTAGE_THAT_TRANSITION=75
>>
>> PERCENTAGE_DELIVERED=100
>> PERCENTAGE_UNDELIVERABLE=0
>> PERCENTAGE_ACCEPTED=0
>> PERCENTAGE_REJECTED=0
>>
>> DISCARD_FROM_QUEUE_AFTER=60000
>>
>> HTTP_PORT=8081
>> HTTP_THREADS=1
>> DOCROOT=www
>> AUTHORISED_FILES=/css/style.css,/index.htm,/inject_mo.htm,/favicon.ico,/images/logo.gif,/images/dots.gif,/user-guide.htm,/images/homepage.gif,/images/inject_mo.gif 
>>
>> INJECT_MO_PAGE=/inject_mo.htm
>>
>> SYSTEM_ID=test
>> PASSWORD=test
>>
>> DELIVERY_MESSAGES_PER_MINUTE=12000
>> DELIVER_MESSAGES_FILE=deliver_messages.csv
>>
>> LOOPBACK=FALSE
>>
>> OUTBOUND_QUEUE_MAX_SIZE=500000
>> INBOUND_QUEUE_MAX_SIZE=500000
>>
>> DECODE_PDUS_IN_LOG=false
>>
>> CAPTURE_SME_BINARY=false
>> CAPTURE_SME_BINARY_TO_FILE=sme_binary.capture
>> CAPTURE_SMPPSIM_BINARY=false
>> CAPTURE_SMPPSIM_BINARY_TO_FILE=smppsim_binary.capture
>> CAPTURE_SME_DECODED=false
>> CAPTURE_SME_DECODED_TO_FILE=sme_decoded.capture
>> CAPTURE_SMPPSIM_DECODED=false
>> CAPTURE_SMPPSIM_DECODED_TO_FILE=smppsim_decoded.capture
>>
>> CALLBACK=false
>> CALLBACK_ID=SIM1
>> CALLBACK_TARGET_HOST=localhost
>> CALLBACK_PORT=3333
>>
>> SMSCID=SMPPSim
>>
>>
>> However, SMPPSim isn't as fast as OpenSMPP, so I had to run 4 
>> instances on separate servers (with additional SMSC configurations in 
>> Kannel accordingly) to reach an MO injection rate of ~600 MOs/sec (no 
>> MTs), in order to trigger the problem.
>>
>> At rates of ~450 MOs/sec, with no MTs, or ~350 MOs/sec + ~320 MTs/sec, 
>> the problem did not surface.
>>
>> Regardless of the SMSC simulator being used, MO injection rates of 
>> around 600 MOs/sec (on the hardware I described before) triggers the 
>> problem. Has anyone been able to reproduce this yet, or does anyone 
>> have an idea why this might happen?
>>
>> Cheers,
>>
> 
> 
> 
> --Thanks,
> Alex
> 
> 
> 


-- 
Giulio Harding
Systems Administrator

m.Net Corporation
Level 13, 99 Gawler Place
Adelaide SA 5000, Australia

Tel: +61 8 8210 2041
Fax: +61 8 8211 9620
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MSN: giulio.harding at mnetcorporation.com

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