topic Re: Inclusive Gateway: Major Performance Issue and Defect in Alfresco Archive

Inclusive Gateway: Major Performance Issue and Defect

tidetom — Wed, 23 May 2012 18:25:19 GMT

Hi all,I've found a major issue with the Inclusive Gateway. This is a very different issue (and IMO even more pressing/critical) than ACT-1204, ACT-1026, and ACT-1073 (the currently reported items for Inclusive Gateway), in that it would seem to negate the benefits of using the Inclusive Gateway en

Re: Inclusive Gateway: Major Performance Issue and Defect

tidetom — Wed, 23 May 2012 21:05:32 GMT

Our team wanted to eliminate if there’s any side effect of things we do, like pause to get the output variables et al, so we have created simple flows with nothing but script tasks. Basically we have 4 flows, each with 5 ScriptTasks controlled by a condition. The flows are:

1. 5 tasks controlled by an inclusive gateway

2. 5 tasks controlled by an exclusive gateway

3. 5 tasks controlled by a parallel gateway

4. 5 tasks controlled by a parallel gateway, followed by an exclusive gateway (emulating Inclusive Gateway functionality)

As expected for exclusive gateway the flow only passed thru one task, for parallel all 5 paths are executed and I set my condition to be true for 3 paths for inclusive gateway and parallelAndExclusive (our old implementation of inclusive gateway) runs.

Results prove: inclusive gateway is buggy.


PROC_DEF_ID_                    SUM(DURATION_) REAL_ELAPSED_TIME MIN(START_TIME_)              MAX(END_TIME_)                  TASKCNT
svc_f_test_igw:1:736265         3253           5.792             23-MAY-12 12.04.28.790000 PM  23-MAY-12 12.04.34.582000 PM    3
svc_f_test_eXgw:1:736261        80             0.08              23-MAY-12 12.04.24.739000 PM  23-MAY-12 12.04.24.819000 PM    1
svc_f_test_pgw:1:736273         162            0.336             23-MAY-12 12.04.36.272000 PM  23-MAY-12 12.04.36.608000 PM    5
svc_f_test_pgwPluseXgw:1:736269 115            0.177             23-MAY-12 12.04.40.701000 PM  23-MAY-12 12.04.40.878000 PM    3

I can provide the ZIP file upon request with the tested BPMN flows, and an output captured using the following query:


SELECT proc_def_id_,
       SUM(duration_),
       extract (second FROM (MAX(end_time_) - MIN(start_time_))) real_elapsed_time,
       MIN(start_time_),
       MAX(end_time_),
       SUM(decode(act_type_, 'scriptTask', 1, 0)) - 2 taskcnt
FROM   act_hi_actinst
GROUP  BY proc_def_id_

All help is very much appreciated.

Activiti Developers / QA - please let me know if you'd like me to submit a JIRA issue for this item.

Thanks in advance,
Tom

Re: Inclusive Gateway: Major Performance Issue and Defect

trademak — Thu, 24 May 2012 08:36:06 GMT

Hi Tom,

Thanks for the detailed description.
Could you create a JIRA and attach a ZIP with a unit test project so that I can run it and try to reproduce it, before I can seek for a solution?

Thanks,

Re: Inclusive Gateway: Major Performance Issue and Defect

tidetom — Fri, 25 May 2012 22:29:53 GMT

Hi Tijs,

Good to hear from you, and thank you for the quick reply. I have added JIRA issue ACT-1231: http://jira.codehaus.org/browse/ACT-1231.

Please let me know if there's anything else I can do to help this item along.

Thanks again,
Tom

Re: Inclusive Gateway: Major Performance Issue and Defect

tidetom — Mon, 04 Jun 2012 17:18:47 GMT

Hi Tijs,

I'm curious if you think this issue might be something that would be fixed in the near term, or longer term? I don't mean to pressure you, but just ask because given its effect on performance, our team is trying to decide whether to change all of our inclusive gateways back to the equivalent parallel + exclusive gateway combination or not. Naturally if this is something that will be investigated and potentially fixed in 5.10, then we'd prefer not to go through that effort. If later than that, then we'd probably go ahead with changing our flows so that inclusive gateways are no longer used.

Thanks in advance,
Tom

Re: Inclusive Gateway: Major Performance Issue and Defect

cirerenat — Thu, 07 Jun 2012 00:06:20 GMT

Should we avoid using Inclusive Gateways until this is addressed? The workaround (parallel + exclusive gateways) seems to make the flows quite crowded and not very clear to the business people.
Regards

Re: Inclusive Gateway: Major Performance Issue and Defect

silvioneto — Thu, 10 Oct 2013 18:00:08 GMT

I've added a comment on [http://jira.codehaus.org/browse/ACT-1231]. I think it's relevant…

Re: Inclusive Gateway: Major Performance Issue and Defect

jbarrez — Mon, 21 Oct 2013 11:20:17 GMT

I don't believe the inclusive gateway needs history enabled. And of course your index remarks is correct.