ODI Scenario status

Question

Hi Guys,
I am developing an ODI (11.1.1 on 11g R2) system to import and process flat files.
I have a worker package 'compiled' into a scenario so that i can start multiple workers asynchronously. the worker package is designed such that it works on a continous loop - reading records from a table, fetching and processing the indicated files and then waiting for the next record to be present (in reality this will be working 24/7). So a worker will never complete unless under error conditions (or a forced stop).
So i have a controller package which starts 5 of these workers, each with a different set of start up parameters.
Everything works just great, but i need to build in more error handling, graceful restarting etc.
The main requirment i have is that if any one of the workers falls over for whatever reason then i need to stop all the other workers, perform some clean up and then restart all the workers.
My original controller had ODIWaitForChildSession step but this is insufficient as it waits for all the sessions to end. but with my design the workers which did not fall over will continue to run.
So.
My question is:
How and what can i poll from within my controller flow to determine the status of a child session?
My thinking was to replace the ODIWaitForChildSession step with something which polls the status of all child sessions and then send a stop command to all sessions if it's detects if one ended in error - then do some clean up and loop back to the section which starts the workers anew.
I am assuming it is possible as what i want to do is only a little different from the in-built ODIWaitForChildSession step - or actually, maybe i am just missing something simple.
Any help would be greatly appreciated.
Regards
Jay

Answer 1

Since all the process are in asynchronous mode so odiwait for child option is good to handle this & only drawback is that it wait untill all the sessions have been finished.
Since you need to track all the process there is a solution for it.
let say you have worker process w1,w2,w3 etc ..
1. create a log table which conatin column like scenario name, scn id , status i,e fail, suceess etc 0 ,1.
1. create a proc eg proc1 which contain odiprevsteplog. It will determine previous step detail & insert this into log table log1 above step1
2. Attach proc1 above to process w1,w2,w3
w1-->proc1
w2-->proc1
w3-->proc1
3. after 2 step, create a variable (v_chk) refresh mode to check status from log table & if any worker w1,w2,w4, if faill then exit
w1-->proc1 -->v_chk
w2-->proc1 -->v_chk
w3-->proc1 -->v_chk