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  1. Percona XtraBackup
  2. PXB-1022

LP #1551634: xtrabackup --slave-info does not handle multi-master replication

Details

    • Bug
    • Status: Done
    • Low
    • Resolution: Fixed
    • None
    • None
    • None

    Description

      **Reported in Launchpad by Johan Nilsson last update 02-05-2017 08:35:55

      When running Percona Xtrabackup 2.4.1, the option --slave-info does not include channel name.
      And as far as I can understand when reviewing the code, multiple channels will not work correctly...

      1. xtrabackup --version
        xtrabackup version 2.4.1 based on MySQL server 5.7.10 Linux (x86_64) (revision id: a2dc9d4)
      1. mysql -e "select @@version
        ------------
        @@version

        ------------

        5.7.11-log

        ------------

      2. mysql -e "show slave status\G"
                                                          • 1. row ***************************
                                                            Slave_IO_State: Waiting for master to send event
                                                            Master_Host: <host>
                                                            Master_User: <user>
                                                            Master_Port: 3306
                                                            Connect_Retry: 60
                                                            Master_Log_File: mysql-bin.000003
                                                            Read_Master_Log_Pos: 151
                                                            Relay_Log_File: mysql-relay-<host>.000011
                                                            Relay_Log_Pos: 364
                                                            Relay_Master_Log_File: mysql-bin.000003
                                                            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: mysql.%
                                                            Last_Errno: 0
                                                            Last_Error:
                                                            Skip_Counter: 0
                                                            Exec_Master_Log_Pos: 151
                                                            Relay_Log_Space: 747
                                                            Until_Condition: None
                                                            Until_Log_File:
                                                            Until_Log_Pos: 0
                                                            Master_SSL_Allowed: No
                                                            Master_SSL_CA_File:
                                                            Master_SSL_CA_Path:
                                                            Master_SSL_Cert:
                                                            Master_SSL_Cipher:
                                                            Master_SSL_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: 972
                                                            Master_UUID: 7095dd7c-d634-11e5-8252-6cae8b52a7ba
                                                            Master_Info_File: mysql.slave_master_info
                                                            SQL_Delay: 0
                                                            SQL_Remaining_Delay: NULL
                                                            Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
                                                            Master_Retry_Count: 86400
                                                            Master_Bind:
                                                            Last_IO_Error_Timestamp:
                                                            Last_SQL_Error_Timestamp:
                                                            Master_SSL_Crl:
                                                            Master_SSL_Crlpath:
                                                            Retrieved_Gtid_Set:
                                                            Executed_Gtid_Set:
                                                            Auto_Position: 0
                                                            Replicate_Rewrite_DB:
                                                            Channel_Name: <channel>
                                                            Master_TLS_Version:
      1. cat xtrabackup_slave_info
        CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=151

      Looking at storage/innobase/xtrabackup/innobackupex, it seems like the info for xtrabackup_slave_info is fetched from 'SHOW SLAVE STATUS', when I guess that the correct way should be to select information from mysql.slave_master_info, mysql.slave_relay_log_info and mysql.gtid_executed.
      An alternative solution whould be to get configured channel names from mysql.slave_master_info, and then do 'SHOW SLAVE STATUS FOR CHANNEL $channel_name'

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            Unassigned Unassigned
            lpjirasync lpjirasync (Inactive)
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              Updated:
              Resolved:

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