公司里 mysql 一主两从（阿里云），偶尔会出现 Communications link failure，错误，应该怎么排查？ java 错误日志： java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3011) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3469) ... 86 common frames omitted com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 81,184 milliseconds ago. The last packet sent successfully to the server was 81,184 milliseconds ago.**
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