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Lock wait time out exceeded mysql : replication stops (no replies)

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Hi,

From the last 2 weeks my replication stops with the following errors:

Last_SQL_Errno: 1205
Last_SQL_Error: Could not execute Update_rows event on table sample.organization_unit; Lock wait timeout exceeded; try restarting transaction, Error_code: 1205; handler error HA_ERR_LOCK_WAIT_TIMEOUT; the event's master log bin.000507, end_log_pos 37119987
1 row in set (0.00 sec)


I have tried increasing the lock_wait_timeout fro 60 to 120. My transaction_isolation level is : read committed, replication_format is 'mixed'.

Please help me on this.

Note: This happens once or twice per day. We have a master-master replication set up.

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