3657
MariaDBERRORNotableReplicationHIGH confidence
Replication network packet exceeds max_allowed_packet
Production Risk
High — Replication I/O thread stops; replica falls behind primary.
How to reproduce
trigger — this will error
trigger — this will error
-- Large BLOB insert replicated with row-based replication
expected output
ERROR 3657 (HY000): Replication network packet exceeds max_allowed_packet.
Fix
Increase max_allowed_packet
Increase max_allowed_packet
SET GLOBAL max_allowed_packet = 1073741824; -- 1GB -- Also set in my.cnf: max_allowed_packet=1G
Why this works
Raises the packet size limit to accommodate large binlog events.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 3657 ER_REPLICA_NETWORK_PACKET_TOO_LARGE
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