MQSeries.net :: View topic - MsgId and CorrelId are blank after MQOutput node

lium · Posted: Mon Sep 08, 2008 8:10 pm Post subject:

I have an application to send request to legacy system via MQOutput. It stores some session info into a local queue(let's call it session queue) via MQOutput before it sends out the request. To correlate the legacy response and session message, the correlid of session message(1) = msgId of request message to legacy (2)= correlId of response message from legacy message(3).
To implement (1) =(2), the flow uses FlowOrder to coordinate:
first terminal -> Compute11 node which set MsgId =MQMI_NONE and CorrelId = MQCI_NONE -> MQOutput1 which stores session message with "New Message Id" and "New Correlation Id" CHECKED. ->Compute12 which stores session message correlId as:
SET Environment.variables.requestOutboundCorrelId = InputLocalEnvironment.WrittenDestination.MQ.DestinationData.correlId;

Second Terminal -> Compute21 which addes MQMD and MQIIH, it has code as SET OutputRoot.MQMD.MsgId = Environment.variables.requestOutboundCorrelId -> MQOutput2 with "New Message ID" and "New Correlation Id" UNCHECKED

The flow works as designed in windows, through debugger, I saw after MQOutput1, the new MsgId and CorrelId were both populated to LocalEnvironment.WrittenDestination.MQ.DestinationData. The problem is when the flow was deployed to Z/OS, both MsgId and CorrelId were blank(MQMI_NONE and MQCI_NONE) after MQOutput1 which it is not supposed to be.
PS. The session queue is with indexType = MQIT_CORREL_ID.
The Compute11 and Compute12 have mode "Message", the Compute21 has mode "LocalEnvironment and Message" since the MQOutput2 has Destination Mode "Destination List". All nodes have Transaction mode "Automatic"
I personally suspect a little it could be transaction issue. Since in Z/OS, it is global transaction, so MQOutput1 and MQOutput2 will be committed at the same time? but MQOutput1 and MQOutput2 are coordiated by FlowOrder, MQOutput1 should go before MQOutput2 , hmm, really confused.
Could anybody help me out of this?