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Seconds_Behind_Master is always 0

Description

Configuration is the same as in MDEV-9595.

SHOW SLAVE '<any channel>' STATUS\G always shows Seconds_Behind_Master: 0, while SQL and IO thread are running, and Exec_Master_Log_Pos and Relay_Log_Space are changing. I tried stopping SQL thread for a day and stopping both IO and SQL threads for a hour, but when I start the threads again, Seconds_Behind_Master is still 0 all the time. Masters are quite busy servers, and we can observe lags in other slaves running MariaDB 10.0.17.

Environment

Linux. Replicating many RDS instances.

Status

Assignee

Unassigned

Reporter

Игорь Пашев

Labels

External issue ID

None

External issue ID

None

Components

Affects versions

10.1.11

Priority

Minor