is much better indicator than Seconds_behind_master.
1000 seconds behind can mean single long running transaction whereas 15 seconds behind can mean 40 transactions behind. A DBA could be concerned more about slave lag of 40 transactions than about 1 transaction lag. This will also allow for better alerts by monitoring tools.
Alexander Keremidarski
added a comment - In my humble opinion a message like:
"N transactions behind the master"
is much better indicator than Seconds_behind_master.
1000 seconds behind can mean single long running transaction whereas 15 seconds behind can mean 40 transactions behind. A DBA could be concerned more about slave lag of 40 transactions than about 1 transaction lag. This will also allow for better alerts by monitoring tools.
Andrei Elkin
added a comment - bnestere , salle , as noted practically (thanks to pandi.gurusamy who pointed to that) we have had this feature in form of
GTIDs_behind_master = ShowSlaveStatus::Gtid_IO_Pos - @@global.gtid_slave_pos
I'd close the ticket.
The show slave status also has the ShowSlaveStatus::Gtid_Slave_Pos. May be we just need to introduce a new variable in SSS to compute the difference?
Pandikrishnan Gurusamy
added a comment - - edited The show slave status also has the ShowSlaveStatus::Gtid_Slave_Pos . May be we just need to introduce a new variable in SSS to compute the difference?
What about tracking the number of transactions/GTIDs that remain un-executed in the relay log (e.g. incremented when the IO thread queues a GTID event, and decremented when SQL thread/worker commit a trx)?
Brandon Nesterenko
added a comment - What about tracking the number of transactions/GTIDs that remain un-executed in the relay log (e.g. incremented when the IO thread queues a GTID event, and decremented when SQL thread/worker commit a trx)?
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Brandon Nesterenko
Andrei Elkin
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Task
Major
In my humble opinion a message like:
"N transactions behind the master"
is much better indicator than Seconds_behind_master.
1000 seconds behind can mean single long running transaction whereas 15 seconds behind can mean 40 transactions behind. A DBA could be concerned more about slave lag of 40 transactions than about 1 transaction lag. This will also allow for better alerts by monitoring tools.