HEARTBEAT_LOG_EVENT

This event does not appear in the binary log. It's only sent over the network by a master to a slave server to let it know that the master is still alive, and is only sent when the master has no binlog events to send to slave servers.

This event is never written into the binary log file

Header

• Timestamp is set to 0

• Next position is set to last pos

• Type is set to HEARTBEAT_EVENT (0x1b)

Fields

• string The current master binary log name

Example of Transmission (Without CRC32)

T 127.0.0.1:8808 -> 127.0.0.1:57157 [AP]
  23 00 00 04 00 00 00 00    00 1b 67 2b 00 00 22 00    '.........g+..&.
  00 00 ed 01 00 00 20 00    66 6f 6f 2d 62 69 6e 2e    ...... .log-bin.
  31 30 30 30 31 33 39                                  1000139

Network Replication protocol, 5 bytes

• packet size [3] = 23 00 00 => 00 00 23 => 35 (ok byte + event size)

• pkt sequence [1] = 04

• OK indicator [1] = 0 (OK)

Heartbeat event

Header

• Timestamp [4] = 00 00 00 00 => 0

• Event Type [1] = 1b => 27

• Server_id [4] = 67 2b 00 00 => 00 00 2b 67 => 111111

• Event Size [4] = 22 00 00 00 => 00 00 00 26 => 34 (header + data)

• Next_pos [4] = ed 01 00 00 => 00 00 01 ed => 493

• Flags [2] == 20 00 => 00 20 = > 32

Content, string

• log-bin.1000139

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