服務器環境
架構圖
架構搭成后，在B機器上發現主從報錯Last_IO_Errno: 1595
Last_IO_Error: Relay log write failure: could not queue event from master
最終發現是B和C開啟了半同步復制，而A機器是5.5版本，沒有半同步參數設置，從而造成主從復制1595錯誤
解決辦法：關閉B和C半同步復制，使用異步復制。
另一現象：
A和B想做成主主復制， 即版本低的MySQL5.5做為MySQL5.7的從庫
主從報錯：
Got fatal error 1236 from master when reading data from binary log: 'Slave can not handle replication events with the checksum that master is configured to log; the first event 'mysql-bin.000106' at 165107652,the last event read from '/opt/mysql/binlogs/mysql-bin.000106' at 123, the last byte read from '/opt/mysql/binlogs/mysql-bin.000106' at 123.'
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