From: John Couch on
Using ActiveMQ (JDBC Master Slave), On startup one master grabs an exclusive
lock in the broker database - all other brokers are slaves and pause waiting
for the exclusive lock. The lock the master is grabbing is an
updlock/rowlock. the database transaction log is growing from normal use in
the database, and we are unable to backup the transaction log or truncate the
log because of the open transaction.