2002
MariaDBERRORCommonReplicationHIGH confidence
Network write error to replica during replication
Production Risk
Critical — replication halts.
What this means
The source server encountered a network write error while sending binary log events to the replica. This is the source-side complement of 2001 and causes the binlog dump thread to terminate.
Why it happens
- 1Replica disconnected abruptly while source was writing an event.
- 2Network failure or TCP reset between source and replica.
- 3Replica crashed or was restarted during streaming.
How to reproduce
trigger — this will error
trigger — this will error
-- Observed in source server error log, not triggered by SQL
expected output
ERROR 2002: Got error writing communication packets.
Fix 1
Restart replication from the replica side
Restart replication from the replica side
-- On replica: START SLAVE;
Why this works
The replica reconnects and the source resumes the binlog dump.
Fix 2
Investigate source error log for the root cause
Investigate source error log for the root cause
-- Review /var/log/mysql/error.log on source
Why this works
Detailed packet-level errors are recorded in the source error log.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 2002 ER_MASTER_NET_WRITE
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