java - IBM MQ Open input count shows 2 for websphere MDB with max sessions 1 (Causing reordering of messages) -
my issue similar : spring jms - ibm mq has open input count issue
i have set message driven bean have max-sessions 1 sequential message delivery in websphere. assume 1 connection should open queue. see open input count 2 times. times 2 different process in picture, same. normal behavior of websphere? please advise. investigating messsage re-ordering issue, of great help.
websphere version 8.5.1 , ibm mq version 7.0 mdb configured via activation spec
the 2 instances queue opened different 1 has queue opened browsing , other has open destructive gets. don't see how having opened twice these affect ordering of messages.
mq doesn't guarantee ordering of messages default. if message ordering important should use message groups, explicitly define ordering of messages in mqmd of each message.
without message groups need meet number of requirements assume message ordering kept mq.
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