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Description

MariaDB Error 1744 indicates a critical data integrity issue during replication. It means that when the replica server attempts to read an event from a binary log file, the calculated checksum does not match the checksum embedded within the event. This typically signifies corruption in the binary log data, preventing proper synchronization between the source and replica.

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Error Message

Replication event checksum verification failed while reading from a log file.

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Known Causes

3 known causes

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Corrupted Binary Log File

The binary log file on the source or replica server may have been corrupted due to disk errors, unexpected system shutdowns, or file system issues.

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Network Data Corruption

Data packets containing binary log events may have been corrupted or lost during transmission over an unstable or faulty network between the source and replica.

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Underlying Hardware Problems

Faulty disk drives, failing memory modules, or other hardware malfunctions on either server can lead to incorrect data being written or read from binary log files.

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Solutions

4 solutions available

1. Restart the Slave Server easy

A simple restart can often resolve transient replication issues.

1

Gracefully stop the MariaDB slave server process. The exact command may vary depending on your operating system and installation method.

sudo systemctl stop mariadb
# or
sudo service mysql stop

2

Start the MariaDB slave server process.

sudo systemctl start mariadb
# or
sudo service mysql start

3

Check the slave status to ensure replication has resumed and is healthy.

SHOW SLAVE STATUS\G

2. Reset Slave and Re-initialize Replication medium

This involves stopping replication, resetting its state, and reconfiguring it from scratch.

1

Connect to the MariaDB slave server.

mysql -u your_user -p

2

Stop the slave threads.

STOP SLAVE;

3

Reset the slave configuration. This will clear all replication-related settings.

RESET SLAVE;

4

Re-configure the replication using the master's binary log file name and position. You can obtain these from SHOW MASTER STATUS on the master, or from SHOW SLAVE STATUS\G on the slave *before* resetting it (if you can capture it).

CHANGE MASTER TO MASTER_HOST='master_host_ip', MASTER_USER='replication_user', MASTER_PASSWORD='replication_password', MASTER_LOG_FILE='mysql-bin.XXXXXX', MASTER_LOG_POS=XXXXXX;
START SLAVE;

5

Verify the slave status.

SHOW SLAVE STATUS\G

3. Disable Binlog Checksum Verification Temporarily easy

This is a quick workaround to identify if checksums are the root cause, but should not be a permanent solution.

1

Connect to the MariaDB slave server.

mysql -u your_user -p

2

Stop the slave threads.

STOP SLAVE;

3

Disable binlog checksum verification. This setting is applied per-connection.

SET GLOBAL slave_exec_mode = 'IDEMPOTENT';
SET GLOBAL slave_parallel_workers = 0;
SET GLOBAL slave_parallel_type = 'NONE';

4

Start the slave threads.

START SLAVE;

5

Monitor the slave status closely. If replication proceeds without checksum errors, it indicates a potential issue with the binlog checksums themselves or their generation/transmission.

SHOW SLAVE STATUS\G

6

IMPORTANT: This is a temporary measure. Investigate the root cause. To re-enable checksums, restart the slave server or reset the global variables (though restarting is cleaner).

SET GLOBAL slave_exec_mode = 'STRICT';
SET GLOBAL slave_parallel_workers = default_value;
SET GLOBAL slave_parallel_type = default_value;

4. Investigate Master Binary Log Corruption advanced

The error might originate from corrupted binary logs on the master server.

1

Connect to the MariaDB master server.

mysql -u your_user -p

2

Check the master's binary log status.

SHOW MASTER STATUS;

3

If you suspect a specific binary log file is corrupted, you can try to examine it using `mysqlbinlog`. Be cautious as this can be a complex operation.

mysqlbinlog --verbose --base64-output=DECODE-ROWS /path/to/corrupted/mysql-bin.XXXXXX

4

If corruption is confirmed, you may need to skip the corrupted event(s) on the slave (if the corruption is isolated to a few events and the data can be manually reconciled) or, more drastically, re-initialize replication from a clean backup.

STOP SLAVE;
SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; -- Adjust the number as needed
START SLAVE;

5

If re-initialization is required, take a consistent backup of the master, restore it on a new slave instance, and reconfigure replication.

mysqldump -u root -p --all-databases --master-data=2 > full_backup.sql
# On new slave:
mysql -u root -p < full_backup.sql

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Related Errors

5 related errors

MariaDB Error 1744: Binlog Checksum Verification Failure