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Description

MySQL Error 2022 indicates that the `SHOW REPLICA STATUS` command (or `SHOW SLAVE STATUS` in older versions) failed to execute successfully. This typically occurs when the database cannot retrieve or provide information about its replication state, often on a replica server, pointing to an underlying issue with the replication setup or server health.

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Error Message

Error on SHOW REPLICA STATUS:

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Known Causes

4 known causes

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Replication Not Running

The MySQL server is not configured as a replica, or its replication threads have been stopped or failed unexpectedly.

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Missing User Privileges

The user account attempting to execute `SHOW REPLICA STATUS` does not possess the required `REPLICATION CLIENT` privilege.

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Client Connection Interrupted

The network connection between the client application and the MySQL server was lost or unstable during the query execution.

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MySQL Server Unresponsive

The MySQL server process itself may be down, hung, or experiencing critical issues preventing it from processing queries.

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Solutions

4 solutions available

1. Verify Replication User Credentials and Permissions easy

Ensure the replication user has the necessary privileges and correct credentials on the replica.

1

Connect to your replica MySQL server as a user with sufficient privileges (e.g., root).

2

Check the replication user's privileges. The user needs at least REPLICATION SLAVE or REPLICATION CLIENT privileges.

SHOW GRANTS FOR 'replication_user'@'%'

3

If the user is missing privileges, grant them. Replace 'replication_user' and '%' with your actual replication username and the host it connects from.

GRANT REPLICATION SLAVE ON *.* TO 'replication_user'@'%';
FLUSH PRIVILEGES;

4

Verify the replication user's password in the replica's `CHANGE REPLICATION SOURCE TO` (or `CHANGE MASTER TO` for older versions) statement. Ensure it matches the password on the source.

SHOW REPLICA STATUS

5

If the password is incorrect, update it on the replica using `CHANGE REPLICATION SOURCE TO`.

CHANGE REPLICATION SOURCE TO SOURCE_USER='replication_user', SOURCE_PASSWORD='new_password';

6

Restart the replication threads after making changes.

START REPLICA

2. Check Network Connectivity Between Source and Replica easy

Confirm that the replica can reach the source server on the configured replication port.

1

Identify the hostname/IP address and port used for replication from the `SHOW REPLICA STATUS` output (SOURCE_HOST, SOURCE_PORT).

SHOW REPLICA STATUS

2

From the replica server's command line, attempt to connect to the source server on the replication port using `telnet` or `nc` (netcat). Replace `source_host` and `source_port` with your values.

telnet source_host source_port
# OR
nc -vz source_host source_port

3

If the connection fails, troubleshoot network issues. This could involve checking firewalls on both the source and replica, routing, or DNS resolution.

4

Ensure that the `SOURCE_HOST` in `SHOW REPLICA STATUS` is resolvable and accessible from the replica. If using hostnames, check DNS settings.

3. Examine Replica's Binary Log Position and Source's Binary Log Status medium

Ensure the replica is attempting to read from a valid binary log file and position on the source.

1

On the replica, check the `SHOW REPLICA STATUS` output for `SOURCE_LOG_FILE` and `SOURCE_LOG_POS`. Note these values.

SHOW REPLICA STATUS

2

Connect to the source MySQL server and check if the `SOURCE_LOG_FILE` exists and contains events up to or beyond `SOURCE_LOG_POS`. You can use `SHOW BINARY LOGS;` to list available logs.

SHOW BINARY LOGS;
# To check a specific log file:
# (This can be resource intensive on large logs)
# SHOW BINLOG EVENTS IN 'your_source_log_file.bin' LIMIT 10;

3

If the `SOURCE_LOG_FILE` is no longer available on the source (e.g., due to `expire_logs_days` being too low), or if the `SOURCE_LOG_POS` is invalid, replication will fail. You may need to re-initialize replication.

4

To re-initialize replication: Stop replica threads, reset replica state, obtain a fresh dump from the source (including binary log position), and reconfigure the replica. This is a more involved process and should be done carefully.

STOP REPLICA;
RESET REPLICA ALL;
# ... proceed with fresh dump and CHANGE REPLICATION SOURCE TO ...

4. Restart Replication Threads and Check Error Log easy

A simple restart can resolve transient issues, and the MySQL error log provides detailed diagnostics.

1

On the replica, stop the replication threads.

STOP REPLICA

2

Check the MySQL error log on the replica for any specific messages related to replication failures. The location of the error log is typically found in the MySQL configuration file (`my.cnf` or `my.ini`) under the `log-error` directive.

tail -f /path/to/your/mysql/error.log

3

Analyze any errors found in the log. They often provide more context than the generic 2022 error.

4

Start the replication threads again.

START REPLICA

5

After restarting, re-run `SHOW REPLICA STATUS` to see if the error persists and check the `Last_Error` and `Seconds_Behind_Source` fields.

SHOW REPLICA STATUS

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Related Errors

5 related errors

MySQL Error 2022: Replication Status Probe Failure