Why does messages go into Recovery Callback Queue - urgent

Question

Env : BPEL 10.1.3.4 , Web logic 9.2
Scenario:
We have a process(Lets say A) putting messages from into a MQ(lets say Q1).
Another Application processes the messages from Q1 and puts some messages into another Queue (Q2).
We have another process B (Lets say B) which reads from this Q2 and calls the Process A’s callback operation(using right correlation parameters) thus releasing “receive” acitivty of Process A and hence flow goes further.
Problem :
While the above scenario is working as expected for some cases(approx. 60%) we observed the following :
i)     A’s receive activity is still waiting to receive a callback from B.
ii)     All the instances where A is waiting for receive has gone to “Recovery Callback” and sits there. When we manually recover them , Process A’s receive gets executed and works as expected.
iii)     In some cases where the flow went successfully ( ie., receive receives the callback) , receive activity received the callback long time after the message is places in Q2. ( in some cases it is 9 to 10 hrs).
Questions:
i)     Why does instances go into “recover callback” ? What can we do to avoid this ? ( Kindly dont suggest ways to recover, I am looking for a preventive measure)
ii)     Process A's recieve activity sometimes receive the callback after some 9 hrs and the flow passes on. I am wondering how can this happen as "synchMaxTime" is set to 900 secs in our case ( 15 mins). I thought any instance waiting for more than 15 mins for callback should have got timedout. Is this setting only for synch calls ?
Few other things
1. The Process B listening to Q2 is having a delay between messages as 3.66 secs . This is to throttle messages coming so quick to bpel as it may not have sufficent threads to process all of them at a time.
2. synchMaxTime in the Domains = 900 s
3. JTA Timeout in weblogic server is 3000 seconds.
This is very urgent , Kindly help with any input / suggestion you have ASAP. Thanks.
Regards,
Sridhar.
Edited by: Sridhar-SOA on Jul 27, 2011 2:38 AM

Answer 1

Any Updates ?