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Problem: Replication fails when master is mysql-5.1-wl2325-5.0-drop6 and slave is mysql-5.1-new-rpl. The reason is that, in mysql-5.1-wl2325-5.0-drop6, the event type id's were different than in mysql-5.1-new-rpl. Fix (in mysql-5.1-new-rpl): (1) detect that the server that generated the events uses the old format, by checking the server version of the format_description_log_event This patch recognizes mysql-5.1-wl2325-5.0-drop6p13-alpha, mysql-5.1-wl2325-5.0-drop6, mysql-5.1-wl2325-5.0, mysql-5.1-wl2325-no-dd. (2) if the generating server is old, map old event types to new event types using a permutation array. I've also added a test case which reads binlogs for four different versions.