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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) The directory structure of the files in HDFS.
B) The status of the heartbeats of each DataNode.
C) Names of the files in HDFS.
D) A catalog of DataNodes and the blocks that are stored on them.
E) File permissions of the files in HDFS.
F) An edit log of changes that have been made since the last snapshot of the NameNode.
G) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.

2. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 100TB
B) Approximately 33 TB
C) Approximately 25TB
D) Approximately 10TB

3. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
B) Use distcp to copy HBase table files.
C) Use distcp to copy physical blocks from the source to the target destination in your cluster.
D) Use distcp to copy data between directories inside the same cluster.
E) Use distcp to run an internal MapReduce job to copy files.

4. You are running two Hadoop clusters(cluster1 and cluster2), they run identical versions of hadoop.
You want to copy the data inside /home/foo/cluster1 to cluster2 into the directory /home/bar/
What is the correct distcp syntax to copy one directory tree from one cluster to the other cluster?

A) $ distCp cluster1:/home/foo cluster2:/home/bar/
B) $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
C) $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
D) $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/

5. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must be formatted as HDFS
B) They may be formatted in nay Linux filesystem
C) They must not be formatted - - HDFS will format the filesystem automatically
D) They must be formatted as either ext3 or ext4

Solutions: