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MySQL 8.0 Reference Manual  /  ...  /  Startup Options and Replication Channels

17.2.3.3 Startup Options and Replication Channels

This section describes startup options which are impacted by the addition of replication channels.

The following startup settings must be configured correctly to use multi-source replication.

The following startup options now affect all channels in a replication topology.

The values set for the following startup options apply on each channel; since these are mysqld startup options, they are applied on every channel.

  • --max-relay-log-size=size

    Maximum size of the individual relay log file for each channel; after reaching this limit, the file is rotated.

  • --relay-log-space-limit=size

    Upper limit for the total size of all relay logs combined, for each individual channel. For N channels, the combined size of these logs is limited to relay_log_space_limit * N.

  • --slave-parallel-workers=value

    Number of slave parallel workers per channel.

  • slave_checkpoint_group

    Waiting time by an I/O thread for each source.

  • --relay-log-index=filename

    Base name for each channel's relay log index file. See Section 17.2.3.4, “Replication Channel Naming Conventions”.

  • --relay-log=filename

    Denotes the base name of each channel's relay log file. See Section 17.2.3.4, “Replication Channel Naming Conventions”.

  • --slave_net-timeout=N

    This value is set per channel, so that each channel waits for N seconds to check for a broken connection.

  • --slave-skip-counter=N

    This value is set per channel, so that each channel skips N events from its master.