What Can I Do When HBase Fails to Recover a Task and a Message Is Displayed Stating "Rollback recovery failed"?

Question

The system automatically rolls back data after an HBase recovery task fails. If "Rollback recovery failed" is displayed, the rollback fails. After the rollback fails, data stops being processed and the junk data may be generated. How can I resolve this problem?

Answer

You need to manually clear the junk data before performing the backup or recovery task next time.

Install the cluster client in /opt/client.
Run source /opt/client/bigdata_env as the client installation user to configure the environment variable.
Run kinit admin for administrator authentication.
Run zkCli.sh -server business IP address of ZooKeeper:2181 to connect to the ZooKeeper.
Run deleteall /recovering to delete the junk data. Run quit to disconnect ZooKeeper.

Running this command will cause data loss. Exercise caution.
Run hdfs dfs -rm -f -r /user/hbase/backup to delete temporary data.
On Manager, view related snapshot name information from recovery task records.
```
Snapshot [ snapshot name ] is created successfully before recovery.
```
Switch to the client, run hbase shell, and then delete_all_snapshot 'snapshot name.*' to delete the temporary snapshot.