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The "get_master_version_and_clock(...)" function in sql/slave.cc ignores error and passes directly when queries fail, or queries succeed but the result retrieved is empty. The "get_master_version_and_clock(...)" function should try to reconnect master if queries fail because of transient network problems, and fail otherwise. The I/O thread should print a warning if the some system variables do not exist on master (very old master)