Hi Baron Schwartz, I have checked again your website and found out that I made a mistake on how your tool achieve this goal. I think it (mk-heartbeat) is a smart solution to this problem. Thank you so much.
Yours Xu Feng > -----Original Message----- > From: baron.schwa...@gmail.com [mailto:baron.schwa...@gmail.com] On Behalf > Of Baron Schwartz > Sent: 2008年12月26日 0:56 > To: xufeng > Cc: Jake Maul; claudio.na...@gmail.com; andy-li...@networkmail.eu; > mysql@lists.mysql.com > Subject: Re: On fighting with master-slave replication lag > > 2008/12/24 xufeng <xuf...@yuanjie.net>: > > > > > >> -----Original Message----- > >> From: baron.schwa...@gmail.com [mailto:baron.schwa...@gmail.com] On > Behalf > >> Of Baron Schwartz > >> Sent: 2008年12月24日 22:06 > >> To: Jake Maul > >> Cc: mysql@lists.mysql.com > >> Subject: Re: On fighting with master-slave replication lag > >> > >> On Wed, Dec 24, 2008 at 2:31 AM, Jake Maul <jakem...@gmail.com> wrote: > >> > Slightly more complicated (and also probably more accurate- the time > >> > reported by show slave status is known to be unreliable in some cases) > >> > would be a script that inserts a row into a table, then check the > >> > slave over and over till it arrives. Or even better, insert 2 > >> > values... a timestamp that *you* provide (in a shell script, something > >> > like $(date) would work) and a timestamp generated by MySQL.... > >> > assuming the times are syncronized on the master, slave, and the box > >> > you're inserting from, when the insert hits the slave it'll generate > >> > it's own timestamp, which you can then subtract *your* timestamp from. > >> > > >> > There's also a tool in maatkit which does replication tracking, > >> > although I've not yet used it. Judging by the other tools in that > >> > package though, it's probably pretty decent :). > >> > >> It is mk-heartbeat, and it does pretty much what you described, > >> although it's been tweaked to be slightly more complex to suit various > >> real-world scenarios. > >> > > I have read some stuff on http://www.maatkit.org/doc/mk-heartbeat.html and > > am interested in this tool. I guess in reality the mk-heartbeat tool checks > > the output of show master status on the master with focus on the File and > > Position fileds. > > If you really read that link, it puzzles me how you could come to that > conclusion about the tool. It does no such thing and I think > http://www.maatkit.org/doc/mk-heartbeat.html#DESCRIPTION describes > that pretty clearly. Let me know if the documentation needs to be > clarified. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
