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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. You have a cluster running with the FIFO scheduler enabled. You submit a large job A to the
cluster which you expect to run for one hour. Then, you submit job B to the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A) Since job B needs only a few tasks, if might finish before job A completes.
B) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
C) The order of execution of tasks within a job may vary.
D) When a job is submitted, all tasks belonging to that job are scheduled.

2. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the Cluster will all be multiples of 64M
B) The block size of files in the duster will all at least be 64MB.
C) The block size of files in the cluster can be determined as the block is written.
D) The block size of files in the cluster will all be the exactly 64MB.

3. What information is stored on disk on the NameNode? (Choose 4)

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

4. What metadata is stored on a DataNode when a block is written to it?

A) Information on the file's location in HDFS.
B) Node location of each block belonging to the same namespace.
C) Checksums for the data in the block, as a separate file.
D) None. Only the block itself is written.

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

A) A catalog of DataNodes and the blocks that are stored on them.
B) Names of the files in HDFS.
C) The directory structure of the files in HDFS.
D) File permissions of the files in HDFS.
E) The status of the heartbeats of each DataNode.
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.

Solutions: