<p>MySQL replication fails when the server tries to write a value longer than the target column length in the replication metadata tables.</p>
<p>MySQL Error 1742 ER_RPL_INFO_DATA_TOO_LONG signals that data stored in internal replication tables exceeds the column limit. Reduce the value size or widen the column length to resolve the failure.</p>
Data for column '%s' too long
Error 1742 appears with message Data for column '%s' too long when MySQL cannot fit a value into a column inside mysql.rpl_info or related replication tables. The operation aborts and replication stops until corrected.
The server raises the condition while saving channel position, source coordinates, plugin metadata, or Group Replication state. It occurs during START SLAVE, FLUSH RELAY LOGS, or automatic writes by the replication SQL thread.
Replication stoppage means replicas lag or become inconsistent with the primary. Applications that read from replicas may serve stale data, and failover procedures can break.
Oversized hostnames, UUIDs, plugin strings, or custom metadata push column limits past their defined varchar lengths. Schema customisation or version mismatch can also shrink column sizes unexpectedly.
Identify the oversize value with SHOW SLAVE STATUS or error logs, alter the column length, or truncate the stored string before it is written. Restart the replica to resume replication.
Mismatched MySQL versions, long channel names in multi-source setups, and Group Replication seeds often trigger the fault. Adjust configuration variables or rebuild the metadata tables using mysql_upgrade.
Keep replication tables at the default schema, validate configuration strings against column limits during deployments, and run mysql_upgrade after version changes.
Errors 1837, 1872, and 1595 involve replication repository corruption or missing tables. They require schema repair or option adjustments.
Multi-source replication allows channel names up to 64 characters, but earlier versions created channel_name columns limited to 60.
Replication may store fully qualified paths longer than the varchar(255) default, triggering the overflow.
Downgrading can shrink column sizes, so values saved by the newer version no longer fit.
Altering mysql.rpl_info columns without considering future content leads to silent overflows that surface only at runtime.
Raised when the replication repository cannot be accessed or read.
Occurs if the relay log cannot be written because of disk issues or permissions.
Generic fatal replication error signaling severe inconsistency or corruption.
No, it stops only the replica thread where the metadata write failed. The primary continues operating normally.
Ignoring leaves the replica behind, causing data drift. Always fix before relying on the replica for reads or failover.
Yes, but keep a record of default sizes and upgrade procedures to avoid future conflicts.
Galaxy's query versioning and collaboration let teams safely change system tables, review changes, and roll back if issues arise.
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