Since the checksums are added to all events in the binary log on the master and transfered both over the network and written to the relay log on the slave, it is possible to track events corrupted events both because of hardware problems, network failures, and software bugs.
-->チェックする仕組みを入れた。
The checksum used is a CRC-32 checksum, more precisely ISO-3309, which is the one supplied with zlib.
＝＝＞特に気にしなくてもいい