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MySQL replication — issue with mysql.proc during replication from 5.0 to 5.5 host

We are replicating from a mysql 5.0.45 host to a 5.5.26 host over WAN. Every once in a while one of our databases does not accept a query and halts the replication. "'Column count of mysql.proc is ...
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3answers
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Automatic MySQL Replication Fail-over Strategy

I want to know that if replication is down due to some reason as if master is down then what strategy should be followed so that the replication is up instantly without manually intervening the ...