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 options must be configured correctly to use multi-source replication.

--relay-log-info-repository
This must be set to TABLE. If this option is set to FILE, attempting to add more sources to a slave fails with ER_SLAVE_NEW_CHANNEL_WRONG_REPOSITORY. The FILE setting is now deprecated, and TABLE is the default.
--master-info-repository
This must be set to TABLE. If this option is set to FILE, attempting to add more sources to a slave fails with ER_SLAVE_NEW_CHANNEL_WRONG_REPOSITORY. The FILE setting is now deprecated, and TABLE is the default.

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

--log-slave-updates
All transactions received by the slave (even from multiple sources) are written in the binary log.
--relay-log-purge
When set, each channel purges its own relay log automatically.
--slave_transaction_retries
The specified number of transaction retries can take place on all applier threads of all channels.
--skip-slave-start
No replication threads start on any channels.
--slave-skip-errors
Execution continues and errors are skipped for all channels.

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.

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Document créé le 26/06/2006, dernière modification le 26/10/2018
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