MQSeries.net :: View topic - WebSphere MQ unit of work with WebSphere Application Server

razvi.scope · Posted: Thu Dec 11, 2014 5:53 am Post subject:

Hi,
We have this following flow.
WAS1 ---> MQ1 ---> WAS2 ----> MQ2 ----> WAS3

WAS1, WAS2 & WAS3 are three different applications running in WAS 8.5 and MQ1 & MQ2 are the same queue manage running in MQ 7.5. WAS 1 (single JVM) puts some messages in to a queue Q1 in MQ1 through WebSphere MQ provider (JMS) MQ1. WAS2 (4 JVMS in a WAS cluster) picks up the messages from the queue and process it, apply some business logic & then send to SIB queues through default messaging provider and then those messages will be sent to MQ2 (a different set of queues called Q2,Q3,Q4 & Q5). SIB in WAS2 is configured with high availability policy so that only one messaging engine is running in one JVM at any point of time. Messages from the queues (Q2, Q3, Q4 & Q5) will be taken & processed by WAS3 which has 2 JVMS in WAS cluster.
When all these components (WAS1,WAS2,WAS3,MQ1 & MQ2) are up & running then all the messages are flowing end to end with no message loss. But when we shut down the JVM (where messaging engine is running) in WAS2 then 2% in flight messages are lost. Messaging engine failedover to any one of three available JVMS in WAS2 but messages which were inflight to shut down JVM fails. SIB in WAS2 has file store for persistence & all MQ queues are also persistence. When ever I failover the MQ queue manager (currently configured with multiinstance) then there is no message loss.. Queue connection factories are enabled with XA (2 phase commit check box is checked).Please help us to trace the missing messages & how to prevent the message loss.

Thanks in Advance
~ Razvi