25.7.9.2 Point-In-Time Recovery Using NDB Cluster Replication (original) (raw)

25.7.9.2 Point-In-Time Recovery Using NDB Cluster Replication

Point-in-time recovery—that is, recovery of data changes made since a given point in time—is performed after restoring a full backup that returns the server to its state when the backup was made. Performing point-in-time recovery of NDB Cluster tables with NDB Cluster and NDB Cluster Replication can be accomplished using a native NDB data backup (taken by issuing CREATE BACKUP in the ndb_mgm client) and restoring the ndb_binlog_index table (from a dump made using mysqldump).

To perform point-in-time recovery of NDB Cluster, it is necessary to follow the steps shown here:

1. Back up all NDB databases in the cluster, using the START BACKUP command in the ndb_mgm client (seeSection 25.6.8, “Online Backup of NDB Cluster”).
2. At some later point, prior to restoring the cluster, make a backup of the mysql.ndb_binlog_index table. It is probably simplest to usemysqldump for this task. Also back up the binary log files at this time.
   This backup should be updated regularly—perhaps even hourly—depending on your needs.
3. (Catastrophic failure or error occurs.)
4. Locate the last known good backup.
5. Clear the data node file systems (usingndbd --initial orndbmtd --initial).
   Note
   Disk Data tablespace and log files are also removed by--initial.
6. Use DROP TABLE orTRUNCATE TABLE with themysql.ndb_binlog_index table.
7. Execute ndb_restore, restoring all data. You must include the--restore-epoch option when you run ndb_restore, so that thendb_apply_status table is populated correctly. (SeeSection 25.5.23, “ndb_restore — Restore an NDB Cluster Backup”, for more information.)
8. Restore the ndb_binlog_index table from the output of mysqldump and restore the binary log files from backup, if necessary.
9. Find the epoch applied most recently—that is, the maximum epoch column value in thendb_apply_status table—as the user variable @LATEST_EPOCH (emphasized):

SELECT @LATEST_EPOCH:=MAX(epoch)  
    FROM mysql.ndb_apply_status;  

1. Find the latest binary log file (@FIRST_FILE) and position (Position column value) within this file that correspond to @LATEST_EPOCH in thendb_binlog_index table:

SELECT Position, @FIRST_FILE:=File  
    FROM mysql.ndb_binlog_index  
    WHERE epoch > @LATEST_EPOCH ORDER BY epoch ASC LIMIT 1;  

1. Using mysqlbinlog, replay the binary log events from the given file and position up to the point of the failure. (See Section 6.6.9, “mysqlbinlog — Utility for Processing Binary Log Files”.)

See also Section 9.5, “Point-in-Time (Incremental) Recovery”, for more information about the binary log, replication, and incremental recovery.