3250
MariaDBERRORCommonReplicationHIGH confidence
Replication worker thread could not process event
Production Risk
High — replication stops; replica falls behind until the issue is resolved.
How to reproduce
trigger — this will error
trigger — this will error
-- Observed in SHOW REPLICA STATUS when a worker thread fails.
expected output
ERROR 3250 (HY000): Worker N failed executing transaction at source log binlog.000001, position NNN.
Fix 1
Skip the failing event
Skip the failing event
STOP REPLICA; SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; START REPLICA;
Why this works
Skips one event — use only after understanding and accepting the data divergence.
Fix 2
Fix the underlying data issue
Fix the underlying data issue
-- Manually apply the missing row or fix the constraint conflict, then START REPLICA;
Why this works
Resolve the root cause so the event can be applied cleanly.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3250 ER_SLAVE_WORKER_THREAD_COULD_NOT_PROCESS_EVENT
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