Master/Slave jdbc row lock can't be auto-released

[Dingwen Yuan]

Hi folks,

We have tested master/slave configuration with pure jdbc persistence and the
db used are mysql and postgres. When we plugged out the electric cable of
the master machine, the row lock on the table ACTIVEMQ_LOCK cannot be
released. So later neither of the machines can get the lock and become the
master? Is the a known problem? Does any database support row lock auto
release?

Thanks

Dingwen Yuan