mysql percona toolkit Waiting for the --replicate table to replicate - nothing else happens

I'm really new to using the percona tools, and I'm trying to learn how to use them correctly.

I’m having a problem with replication drift in my 4 node mysql setup. I’m running a wiki on this setup. And when I create a new page or edit text in the wiki, the changes will only get saved to one of the 4 db nodes and not get replicated to the others,

I'm running MariaDB-server-10.0.21-1​ on all 4 database nodes.

I’ll then have to go into the wiki config and point the wiki to one DB at a time until I find the missing content. And then I’ll have to replicate the database by hand to the other 3 nodes.

This will happen even tho all indicators of replication seem fine on all 4 db nodes.

For example this is what I see on all of them as demonstrated on the 1st node:

[root@db1:~] #mysql -e "show slave status \G" | egrep "Slave_IO_Running|Slave_SQL_Running|Seconds_Behind_Master"
               Slave_IO_Running: Yes
              Slave_SQL_Running: Yes
          Seconds_Behind_Master: 0

It’s a real pain! So I’m hoping to solve this problem with some help from the percona toolkit.

I just ran a pt-table-checksum command on my 4 node database cluster, and I got this response back:

[root@db1:~] #pt-table-checksum h=localhost -d jfwiki -t text -u admin -p secret --no-check-binlog-format --no-version-check
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...
  Waiting for the --replicate table to replicate to db4...

And it just keeps repeating that message, and nothing else seems to happen. I even let this command run all night with no change. The same message just keeps repeating with no other output.

What do these messages mean? And how can I get past this so that I can really check the state of replication with this tool?

Here’s the full output of the show slave status command in case that provides some more context.

  MariaDB [(none)]> show slave status \G
  *************************** 1. row ***************************
                 Slave_IO_State: Waiting for master to send event
                    Master_Host: db2.example.com
                    Master_User: jf_slave
                    Master_Port: 3306
                  Connect_Retry: 60
                Master_Log_File: mariadb-bin.000082
            Read_Master_Log_Pos: 376
                 Relay_Log_File: db4-relay-bin.000062
                  Relay_Log_Pos: 537
          Relay_Master_Log_File: mariadb-bin.000082
               Slave_IO_Running: Yes
              Slave_SQL_Running: Yes
                Replicate_Do_DB:
            Replicate_Ignore_DB:
             Replicate_Do_Table:
         Replicate_Ignore_Table:
        Replicate_Wild_Do_Table:
    Replicate_Wild_Ignore_Table:
                     Last_Errno: 0
                     Last_Error:
                   Skip_Counter: 0
            Exec_Master_Log_Pos: 376
                Relay_Log_Space: 832
                Until_Condition: None
                 Until_Log_File:
                  Until_Log_Pos: 0
             Master_SSL_Allowed: Yes
             Master_SSL_CA_File: /opt/mysql/ca.crt
             Master_SSL_CA_Path:
                Master_SSL_Cert: /opt/mysql/db4.example.com.crt
              Master_SSL_Cipher:
                 Master_SSL_Key: /opt/mysql/db4.example.com.key
          Seconds_Behind_Master: 0
  Master_SSL_Verify_Server_Cert: No
                  Last_IO_Errno: 0
                  Last_IO_Error:
                 Last_SQL_Errno: 0
                 Last_SQL_Error:
    Replicate_Ignore_Server_Ids:
               Master_Server_Id: 2
                 Master_SSL_Crl: /opt/mysql/ca.crt
             Master_SSL_Crlpath:
                     Using_Gtid: No
                    Gtid_IO_Pos:
  1 row in set (0.00 sec)

Thanks!