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.

Find a PHP function

Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-channels-startup-options.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel MySQL : https://dev.mysql.com/

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut