主服务器的日志写入和对于备用服务器的发送在主服务器上是并行执行的。
The log write at the primary and the send to the standby are performed in parallel on the primary server.
而备用服务器直到从主服务器收到消息，得知它磁盘上具有相同的日志，才写入该日志。
The standby system does not write the log until it hears from the primary that that the same log is on disk there.
主服务器生成的日志由辅助服务器处理；因此所有服务器都必须处于相同的二进制可执行文件上。
The logs generated by the primary server are processed by the secondary server; hence all servers must be on the same binary executable.
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