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MySQL 5.7 Reference Manual  / ...  / Replication  / Replication Implementation  / Replication Channels  /  Replication Channel Naming Conventions

16.2.2.4 Replication Channel Naming Conventions

This section describes how naming conventions are impacted by replication channels.

Each replication channel has a unique name which is a string with a maximum length of 64 characters and is case-insensitive. Because channel names are used in replication metadata repositories, the character set used for these is always UTF-8. Although you are generally free to use any name for channels, the following names are reserved:

  • group_replication_applier

  • group_replication_recovery

The name you choose for a replication channel also influences the file names used by a multi-source replica. The relay log files and index files for each channel are namedrelay_log_basename-channel.xxxxxx, whererelay_log_basename is a base name specified using therelay_log system variable, andchannel is the name of the channel logged to this file. If you do not specify therelay_log system variable, a default file name is used that also includes the name of the channel.