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Description

This error indicates that a specified replication channel, which is crucial for managing a replica's connection and data flow from a source, cannot be found by MySQL. It typically occurs when attempting to start, stop, or query a replication channel that has either not been created, was previously dropped, or its name is misspelled.

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Error Message

Replica channel '%s' does not exist.

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Known Causes

4 known causes

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Incorrect Channel Name

The replication channel name provided in the command or configuration does not exactly match an existing channel due to a typo or case sensitivity.

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Channel Not Initialized

The replication channel has not been properly created using `CHANGE REPLICATION SOURCE TO ... FOR CHANNEL 'channel_name'` or similar commands.

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Channel Previously Removed

The specified replication channel was previously removed using commands like `STOP REPLICA FOR CHANNEL` followed by `RESET REPLICA ALL` or `DROP REPLICA CHANNEL`.

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Configuration Discrepancy

A script or application attempts to reference a replication channel that does not exist on the current MySQL server instance's configuration.

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Solutions

4 solutions available

1. Verify Replica Channel Name easy

Double-check the replica channel name in your configuration and commands.

1

Locate where the replica channel name is being used. This could be in your `my.cnf` or `my.ini` configuration file under the `[mysqld]` section (e.g., `replica_channel = 'my_replica'`), or in the `CHANGE REPLICATION CHANNEL` or `START REPLICA` SQL statements.

2

Compare the name you are using with the actual channel name defined in your replication configuration. Pay close attention to case sensitivity and any leading/trailing spaces.

3

If the name is incorrect, update your configuration file or SQL statements with the correct channel name.

2. Check Existing Replica Channels easy

List and inspect the available replica channels on the replica server.

1

Connect to your MySQL replica server using a client such as `mysql` or MySQL Workbench.

2

Execute the following SQL query to list all available replica channels:

SHOW REPLICAS;

3

Examine the output of the `SHOW REPLICAS;` command. The `Channel_Name` column will list all configured replica channels. Ensure the channel name you are trying to use exists in this list.

4

If the channel is missing, you will need to create it (see Solution 3). If it exists but has a different name, use the correct name in your replication commands.

3. Create or Reconfigure Replica Channel medium

Add a new replica channel or re-establish an existing one.

1

If the replica channel truly does not exist, you need to create it. This is typically done by configuring the replica to connect to a source. First, ensure the replica is not running with the problematic channel.

STOP REPLICA CHANNEL '<channel_name>';

2

Remove any potentially corrupted or incomplete channel configuration. You may need to use `RESET REPLICA` with specific options if the channel was partially set up.

RESET REPLICA ALL;

3

Reconfigure the replica to connect to the source, specifying the desired channel name. Replace placeholders with your actual source details and desired channel name.

CHANGE REPLICATION SOURCE TO SOURCE_HOST='<source_host>', SOURCE_PORT=<source_port>, SOURCE_USER='<replication_user>', SOURCE_PASSWORD='<replication_password>', SOURCE_LOG_FILE='<log_file>', SOURCE_LOG_POS=<log_pos>, REPLICA_CHANNEL='<new_channel_name>';

4

Start the replica with the newly created or reconfigured channel.

START REPLICA CHANNEL '<new_channel_name>';

4. Investigate Replication Configuration Files advanced

Thoroughly review MySQL configuration files for replication channel settings.

1

Identify the MySQL configuration file(s) being used. Common locations include `/etc/my.cnf`, `/etc/mysql/my.cnf`, `/etc/mysql/mysql.conf.d/mysqld.cnf`, or `my.ini` on Windows.

2

Open the relevant configuration file(s) in a text editor.

3

Look for settings related to replication channels, particularly under the `[mysqld]` section. This might include parameters like `replica_channel` or settings related to specific channel configurations if you are using named channels.

4

Ensure that any defined `replica_channel` names are consistent and correctly spelled. If you have multiple replication setups, verify that the channel names are unique and not overlapping.

5

If you find inconsistencies or incorrect channel names, correct them and restart the MySQL server for the changes to take effect.

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Related Errors

5 related errors

MySQL Error 3074: Replica Channel Missing