MQSeries.net :: View topic - Resequence node on Active Passive IIB instance

JVR

Software used:
IIB : V_10.0.0.6
MQ : V_8.0
DP : XI52

Scenario: The client sends data files(soap or flat files) which has to be sent to the target systems in the a sequential order. The messages are received by our Gateway system(DP- running on a single instance) which performs schema validation and punches each message with a sequence number before sending to IIB flow ( running on multiple instances and brokers) which performs required validation,transformation and pushes the transformed and enriched message to a Queue. Basically this flow is handling the heavy weight operations of validations and transformations.
Note: In case of any exceptions a very small dummy message is written to the target Queue with the sequence number of the failed message for the benefit of resequence node.

The target Queue of the above flow will be Input Queue for our light weight Distribution flow (running on a single instance), whose task is just to resequence the messages based on sequence numbers and send it across to a target application. This node would be running on a active passive mode.

Areas of Concern : 1) Would resequence node maintain its current state while switching from active to passive instance ( with the persistence mode set as "Persistence")? Say, MSG1 and MSG3 is on active instance of IIB and is waiting for MSG2, and for some reasons goes down. Would the passive instance (now active) take over and process MSG1,MSG2 and MSG3 in a sequential order (as the message is set as persistence on Queue)?

2) Would the timer ( the start (10 sec) and end(60sec) of sequence definition is set as automatic) on sequence node be reset?

3) What would be the best combination of start of sequence and end of sequence definition to handle fail over scenarios? Currently I'm having the start of sequence definition as predicate ( which is set as true in a xpath by Datapower with the first message in sequence) and end as automatic - set to 60 seconds, which might not be the best of combinations for active/passive env.

Any help is greatly appreciated.
Thanks,

JV