Fake ROTATE_EVENT

An artificial event sent to the replica to indicate the name of the binary log file on the master, ensuring the replica knows which file is being read.

When a slave server connects to a MariaDB master server, the first binlog event sent is Fake ROTATE_EVENT. This event is similar to ROTATE_EVENT, but it's artificial and its purpose is to tell the replica server which the binlog file name of the master is.

This matters when the replica connects with the GTID option (no filename is given) or when using file and pos with empty file name (usually file='' and pos = 4).

The Event Type is ROTATE_EVENT (0x4).

The fake ROTATE_EVENT event is not written in the binlog file. It's created by the master and sent to newly connected replica before FORMAT_DESCRIPTION_EVENT

Header

• Timestamp set to 0.

• Event Tye is ROTATE_EVENT.

• Next Pos is set to 0.

• Flags are set to LOG_ARTIFICIAL_F (0x20).

Content

The content is the same as ROTATE_EVENT.

• pos = the requested pos from slave, usually 4.

• filename = the master binlog filename.

If it is the first fake rotate event, and the global server variable @@binlog_checksum is set to CRC32:

• crc32_checksum (4 Bytes).

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