<p>MySQL cannot recover the slave after a parallel replication crash, halting replication and requiring manual intervention.</p>
<p>MySQL Error 1803 ER_MTS_RECOVERY_FAILURE occurs when the replication slave crashes during parallel execution and the recovery process fails. Restart the server with --tc-heuristic-recover=ROLLBACK, fix any corrupted relay logs, and start replication to resolve the issue.</p>
Cannot recover after SLAVE errored out in parallel
Error 1803 signals that MySQL failed to recover a replication slave after it stopped during parallel replication. The server detects inconsistencies and aborts recovery to prevent data loss.
The replication channel remains broken until an administrator repairs the underlying issue and restarts replication. Ignoring the error leaves the slave out of sync.
The message is raised at server startup or slave restart if crash-safe replication recovery cannot rebuild transactional state. It is common after power loss, OOM kills, or forced shutdowns during heavy parallel apply workloads.
A stalled replica breaks read scaling, increases failover risk, and can silently serve stale data to applications. Quick repair restores redundancy and keeps replicas promotable.
MySQL fails recovery when relay logs or binary log positions are corrupt or missing. Inconsistent GTID sets, disk errors, or incomplete transaction commits also block recovery.
Use crash-safe options, verify relay logs, apply GTID resets, and restart replication.
Disk full, abrupt power loss, or misconfigured parallel workers often trigger the problem. Clearing space or reducing worker count stabilizes recovery.
Enable redundant storage, monitor disk health, and test backups to prevent unrecoverable crashes.
Errors 1593, 1756, and 1862 also halt replication but have distinct root causes and fixes.
Incomplete writes or disk errors damage relay-log files, so the slave cannot apply remaining events.
Manual binlog purges or cross-cluster failovers leave GTID gaps that crash recovery cannot heal automatically.
The server stops mid-transaction when storage fills, leaving partial transactional state that recovery cannot reconcile.
Edge-case MySQL bugs or mis-configured slave_parallel_workers sometimes write inconsistent internal recovery metadata.
Connection lost between master and slave, usually due to network flaps.
Fatal error on slave thread halts replication; often follows log corruption.
Relay log read failure indicates disk or permission problems.
No. The issue is confined to the slave. The master’s data remains intact.
Minor relay log issues can be fixed online, but most cases require a controlled restart with recovery flags.
Turning off parallel replication eliminates some edge cases but also reduces performance. Weigh risk versus throughput.
Galaxy’s query library and monitoring surface replication lag quickly, so teams resolve errors before stale reads hit production.
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