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The following talk about mastering MySQL semi-synchronous replication technology handle_slave_io function calls read_event function method, the secret of the text is close to the topic related. So, no gossip, let's read the following directly, I believe you will benefit from this article after mastering MySQL semi-synchronous replication technology handle_slave_io function calling read_event function method.

The read_event function reads the event from the connection, and if there is no event, it will block here waiting for the master to send the event.

# 0 0x00898402 in _ kernel_vsyscall () # 1 0x00c28133 in poll () from / lib/libc.so.6#2 0x08a90315 in vio_io_wait (vio=0xa82faa8, event=VIO_IO_EVENT_READ, timeout=3600000) at / home/mysql26/mysql-5.6.26/vio/viosocket.c:771#3 0x08a8eb78 in vio_socket_io_wait (vio=0xa82faa8, event=VIO_IO_EVENT_READ) at / home/mysql26/mysql-5.6.26/vio/viosocket.c:68#4 0x08a8ec6a in vio_read (vio=0xa82faa8, buf=0xa882c90 "P") Size=16384) at / home/mysql26/mysql-5.6.26/vio/viosocket.c:123#5 0x08a8ef05 in vio_read_buff (vio=0xa82faa8, buf=0xa89a530 "\ 031", size=4) at / home/mysql26/mysql-5.6.26/vio/viosocket.c:157#6 0x0830e010 in net_read_raw_loop (net=0xa7591b8 Count=4) at / home/mysql26/mysql-5.6.26/sql/net_serv.cc:669#7 0x0830e1f2 in net_read_packet_header (net=0xa7591b8) at / home/mysql26/mysql-5.6.26/sql/net_serv.cc:757#8 0x0830ef83 in net_read_packet (net=0xa7591b8 Complen=0xa34fc168) at / home/mysql26/mysql-5.6.26/sql/net_serv.cc:816#9 0x0830f0ea in my_net_read (net=0xa7591b8) at / home/mysql26/mysql-5.6.26/sql/net_serv.cc:894#10 0x084af8a0 in cli_safe_read (mysql=0xa7591b8) at / home/mysql26/mysql-5.6.26/sql-common/client.c:620#11 0x0866f2da in read_event (mysql=0xa7591b8, mi=0xa709368) Suppress_warnings=0xa34fc31b) at / home/mysql26/mysql-5.6.26/sql/rpl_slave.cc:3533#12 0x086799f6 in handle_slave_io (arg=0xa709368) at / home/mysql26/mysql-5.6.26/sql/rpl_slave.cc:4730#13 0x089b3141 in pfs_spawn_thread (arg=0xa8302b0) at / home/mysql26/mysql-5.6.26/storage/perfschema/pfs.cc:1860#14 0x00cdc832 in start_thread () from / lib/libpthread.so.0#15 0x00c31e0e In clone () from / lib/libc.so.6

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