Percona-Tookit工具包之pt-slave-find

 

Preface

 

    If we want to check out how many slaves in our replication environment.We can execute "show processlit;" on master.Whatif we'd like to check the detail of slaves.We have to execute "show slave status\G" on slaves.

 

Introduce

 

    pt-salve-find is a tool to find and print the the hierarchy tree of MySQL slaves.It can provide us a simple way to check out whether our slaves are working normally.

 

Procedure

 

Usage

 pt-slave-find [OPTIONS] [DSN]

Common parameter

 --host //Specify the host your want to connect.
 --port //Specify the port of the server to connect.
 --user //Specify the username of target instance.
 --password //Specify the password of user.

Example

 

Check out the information on master.

 [root@zlm1 :: ~]
 #pt-slave-find -h192.168.56. -P3306 -urepl -prepl4slave
 192.168.56.100
 Version         5.7.-log
 Server ID
 Uptime          :: (started --21T09::)
 Replication     Is not a slave, has  slaves connected, is not read_only
 Filters
 Binary logging  ROW
 Slave status
 Slave mode      STRICT
 Auto-increment  increment , offset
 InnoDB version  5.7.
 +- zlm3
    Version         5.7.-log
    Server ID
    Uptime          : (started --22T08::)
    Replication     Is a slave, has  slaves connected, is not read_only
    Filters
    Binary logging  ROW
    Slave status     seconds behind, running, no errors
    Slave mode      STRICT
    Auto-increment  increment , offset
    InnoDB version  5.7.
 +- zlm2
    Version         5.7.-log
    Server ID
    Uptime          :: (started --21T09::)
    Replication     Is a slave, has  slaves connected, is not read_only
    Filters
    Binary logging  ROW
    Slave status     seconds behind, running, no errors
    Slave mode      STRICT
    Auto-increment  increment , offset
    InnoDB version  5.7.

Check out the information on slaves.

 [root@zlm1 :: ~]
 #pt-slave-find -h192.168.56. -P3306 -urepl -prepl4slave
 192.168.56.101
 Version         5.7.-log
 Server ID
 Uptime          :: (started --21T09::) //It shows that the slave has been run almost 24 hours.
 Replication     Is a slave, has  slaves connected, is not read_only
 Filters
 Binary logging  ROW
 Slave status     seconds behind, running, no errors
 Slave mode      STRICT
 Auto-increment  increment , offset
 InnoDB version  5.7.

 [root@zlm1 :: ~]
 #pt-slave-find -h192.168.56. -P3306 -urepl -prepl4slave
 192.168.56.102
 Version         5.7.-log
 Server ID
 Uptime          : (started --22T08::) //This was the newly added slave 10 minutes ago.
 Replication     Is a slave, has  slaves connected, is not read_only
 Filters
 Binary logging  ROW
 Slave status     seconds behind, running, no errors
 Slave mode      STRICT
 Auto-increment  increment , offset
 InnoDB version  5.7.

Summary

• There're merely several simple connection parameters you need to specify.
• It's convenient to get the information about slaves on master without executing any commands.
• This tool can also be used to checkout the lag time of slaves.