Error

Error Code: 1597

MariaDB Error 1597: Replication Command Failure

📦 MariaDB

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Description

This error indicates that a command sent from a replica (slave) server to its primary (master) server during replication failed. It typically signifies an issue preventing the primary from executing or responding to a replication-related instruction, disrupting data synchronization and potentially leading to data inconsistencies.

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Error Message

Master command %s failed: %s

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Known Causes

4 known causes

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Network Connectivity Problems

The replica server is unable to establish or maintain a stable network connection with the primary server, preventing replication commands from reaching their destination.

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Primary Server Unresponsive

The primary MariaDB server is offline, overloaded, or not accepting connections, causing commands sent from the replica to fail.

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Replication Configuration Mismatch

Discrepancies in replication settings, such as incorrect primary host, port, user credentials, or insufficient privileges, prevent commands from being processed correctly.

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Primary Server Resource Exhaustion

The primary server is experiencing high CPU, memory, or I/O load, making it unable to process replication commands promptly or causing timeouts.

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Solutions

4 solutions available

1. Check Slave Status and Identify the Failing Command easy

Inspect the slave's replication status to pinpoint the exact command that failed on the master.

Connect to your MariaDB slave server.

Execute the SHOW SLAVE STATUS command to get detailed replication information.

SHOW SLAVE STATUS\G

Examine the output, specifically looking for the 'Last_SQL_Errno' and 'Last_SQL_Error' fields. The 'Master_Command' field (if present) will also indicate the command that caused the issue. The error message in 'Last_SQL_Error' will often provide more context.

If the error message points to a specific SQL statement or operation, investigate that on the master server.

2. Skip the Failing Replication Event medium

Temporarily bypass a problematic replication event to allow replication to catch up.

Connect to your MariaDB slave server.

Execute the SHOW SLAVE STATUS command to identify the current position in the binary log. Note the 'Master_Log_File' and 'Read_Master_Log_Pos'.

SHOW SLAVE STATUS\G

Use the SET GLOBAL SQL_SLAVE_SKIP_COUNTER command to skip the problematic event. The value for 'SQL_SLAVE_SKIP_COUNTER' should be 1 for the current error.

SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;

Restart the slave threads if they have stopped.

STOP SLAVE; START SLAVE;

Monitor SHOW SLAVE STATUS again to ensure replication is progressing. If the same error persists, you might need to skip multiple events, but proceed with caution as this can lead to data inconsistencies.

3. Re-synchronize Slave Data from Master advanced

Perform a full data dump and restore on the slave to ensure consistency.

On the MariaDB master server, stop replication writes to prevent new changes during the dump.

FLUSH TABLES WITH READ LOCK;

Take a consistent snapshot of your master's data. The recommended method is using `mariadb-dump` with `--single-transaction` (for InnoDB) or `--lock-all-tables` (for MyISAM). Ensure you also dump the binary log position.

mariadb-dump -u [user] -p --single-transaction --master-data=2 --all-databases > master_dump.sql

Identify the binary log file and position from the `master_dump.sql` file (look for `CHANGE MASTER TO ...` statements).

On the slave server, stop replication threads.

STOP SLAVE;

Drop all databases on the slave (or the specific databases affected by replication). Be extremely cautious with this step and ensure you have backups.

DROP DATABASE database_name;

Import the data dump into the slave.

mariadb -u [user] -p < master_dump.sql

Configure the slave to replicate from the master using the recorded binary log position.

CHANGE MASTER TO MASTER_HOST='[master_host]', MASTER_USER='[replication_user]', MASTER_PASSWORD='[replication_password]', MASTER_LOG_FILE='[recorded_log_file]', MASTER_LOG_POS=[recorded_log_pos];

Start the slave replication threads.

START SLAVE;

On the master, release the read lock.

UNLOCK TABLES;

4. Investigate Master-Side Issues advanced

Address potential problems on the master that might be causing replication failures.

Examine the master's error logs (e.g., `mariadb.log` or `error.log`) for any related errors or warnings that occurred around the time of the replication failure.

If the error message from `SHOW SLAVE STATUS` indicates a specific SQL error (e.g., constraint violation, duplicate key), investigate if that statement is valid or if there's a data mismatch on the master.

Check the master's binary log configuration (`log_bin`, `binlog_format`) to ensure it's correctly set up for replication.

Verify that the replication user on the master has the necessary privileges (`REPLICATION SLAVE`, `REPLICATION CLIENT`).

SHOW GRANTS FOR 'replication_user'@'slave_host'; -- On the master

If the master is experiencing high load or resource contention, it might be indirectly causing replication issues. Monitor master's performance metrics.

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