Christopher E. Brown wrote:
On Sat, 3 Nov 2007, bob b wrote:
So, a slave is down for 8hrs. It comes online and pulls the binlog in
120 seconds. The "seconds behind master" does not reflect 8hrs, but how
many seconds (at current processing rate) before the slave finishes the
relay logs.
The "seconds behind master" value is really "seconds until currency with
the relay logs" and should prolly be documented as such.
This is incorrect. In most circumstances, it's basically the difference
between the timestamp of the binlog event the SQL thread is currently
processing, and the master's current timestamp (as fetched by the I/O
thread). So it really is what it sounds like: the seconds behind the
master. If it says 100, it means the slave is processing an event that
took place 100 seconds ago on the master.
You can read the source code in show_master_info() in sql/slave.cc.
Baron
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