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WebSphere MQ XA support and Tuxedo

 

WebSphere MQ on Windows and UNIX systems can block Tuxedo-coordinated XA applications indefinitely in xa_start. This can occur only when two or more processes coordinated by Tuxedo in a single global transaction attempt to access WebSphere MQ using the same transaction branch ID (XID). If Tuxedo gives each process in the global transaction a different XID to use with WebSphere MQ, this cannot occur.

To avoid the problem, configure each application in Tuxedo that accesses WebSphere MQ under a single global transaction ID (gtrid), within its own Tuxedo server group. Processes in the same server group use the same XID when accessing resource managers on behalf of a single gtrid, and are therefore vulnerable to blocking in xa_start in WebSphere MQ. Processes in different server groups use separate XIDs when accessing resource managers and so do not have to serialize their transaction work in WebSphere MQ.

 

Parent topic:

General XA support

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