Backup and disaster recovery in Hadoop - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a backup directory in HDFS.

Hadoop

hdfs dfs -mkdir [1]

Drag options to blanks, or click blank then click option'

A/user/data

B/input

C/tmp

D/backup

Attempts:

3 left

💡 Hint

Common Mistakes

Using a directory path that already exists or is not intended for backup.

Forgetting the leading slash in the directory path.

The command 'hdfs dfs -mkdir /backup' creates a backup directory in HDFS.

2fill in blank

medium

Complete the code to copy data from HDFS to the backup directory.

Hadoop

hdfs dfs -cp [1] /backup/

Drag options to blanks, or click blank then click option'

A/user/hadoop/data

B/backup

C/tmp/data

D/user/hadoop/logs

Attempts:

3 left

💡 Hint

Common Mistakes

Copying from the backup directory itself.

Using a temporary or unrelated directory as source.

The command copies data from '/user/hadoop/data' to the backup directory '/backup/'.

3fill in blank

hard

Fix the error in the command to restore data from backup to the original location.

Hadoop

hdfs dfs -mv /backup/[1] /user/hadoop/data

Drag options to blanks, or click blank then click option'

Alogs

Bbackup

Cdata

Dtmp

Attempts:

3 left

💡 Hint

Common Mistakes

Using the backup directory name instead of the data folder.

Using unrelated folder names like 'logs' or 'tmp'.

The data folder inside /backup is moved back to the original location '/user/hadoop/data'.

4fill in blank

hard

Fill both blanks to create a snapshot of the /user/hadoop/data directory.

Hadoop

hdfs dfsadmin -allowSnapshot [1]
hdfs dfs -createSnapshot [2] snapshot1

Drag options to blanks, or click blank then click option'

A/user/hadoop/data

B/backup

D/tmp

Attempts:

3 left

💡 Hint

Common Mistakes

Allowing snapshots on one directory but creating snapshot on another.

Using backup or temporary directories instead of the data directory.

First, snapshots are allowed on the data directory, then a snapshot named 'snapshot1' is created there.

5fill in blank

hard

Fill all three blanks to list snapshots, delete a snapshot, and verify deletion.

Hadoop

hdfs dfs -ls [1]
hdfs dfs -deleteSnapshot [2] [3]
hdfs dfs -ls [1]

Drag options to blanks, or click blank then click option'

A/user/hadoop/data

Csnapshot1

Dsnapshot2

Attempts:

3 left

💡 Hint

Common Mistakes

Using different directories for listing and deleting snapshots.

Deleting a snapshot that does not exist.

The commands list snapshots in the data directory, delete 'snapshot1', then list snapshots again to confirm deletion.