MySQL detects logical corruption inside a binary log file, which halts replication, point-in-time recovery, and other binlog-based operations.
ER_BINLOG_LOGICAL_CORRUPTION signals that a MySQL binary log file is logically damaged, blocking replication or recovery. Identify the bad log, purge or skip it, and restart replication to resolve the issue.
ER_BINLOG_LOGICAL_CORRUPTION
MySQL raises error 1866 when it reads a binary log event that fails internal consistency checks. The server immediately stops replication or point-in-time recovery to protect data integrity.
The error was added in MySQL 5.7.2 and appears in both masters and replicas that read the corrupted log segment.
Corruption can enter the binary log through sudden power loss, disk faults, file system bugs, or bugs in earlier MySQL versions that wrote malformed events.
Network transfer issues can also damage log files when a physical copy of mysql-bin files is moved between servers without checksums.
Pinpoint the exact log file and position reported in the error. On replicas, set the replication start position after the bad event or re-clone the server.
On a primary, purge the corrupted log file once all replicas have caught up to a healthy file, or rebuild the log with mysqlbinlog if recovery is required.
Replication stops at a corrupted event - skip the event or re-sync the replica.
Backup restore fails during mysqlbinlog apply - remove the corrupted segment and restart the apply from the next good position.
Enable sync_binlog and innodb_flush_log_at_trx_commit to flush events safely.
Keep binary logs on reliable storage with ECC RAM and RAID. Monitor dmesg and MySQL error logs for early disk failure signs.
ER_BINLOG_READ_EVENT_CHECKSUM_FAILURE appears when the physical CRC fails. ER_MASTER_FATAL_ERROR_READING_BINLOG indicates the replica cannot read the master’s binary log stream. Solutions overlap: replace or skip the bad log and restart replication.
Power loss or kill -9 can leave the last binary log event half-written and logically inconsistent.
Bad sectors or file system corruption damage mysql-bin files even if MySQL shuts down correctly.
Older releases before 5.6.20 contained bugs that occasionally wrote malformed row events.
Copying binary logs with scp or rsync without checksum verification can introduce silent bit flips.
Physical checksum mismatch in a binlog event.
Replica cannot read the master’s binlog due to corruption or permissions.
Replica relay log is corrupted; recreate relay logs to recover.
No. Purge or replace the file. Editing binary logs risks further corruption.
The error targets only binary logs. Your data files remain intact, but replication or backups fail until fixed.
Checksums detect but cannot prevent logical corruption caused by partial writes or file system faults.
Galaxy highlights replication errors in real time and offers one-click snippets to skip or purge corrupted logs, reducing downtime.
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