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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Using hadoop's default settings, how much data will be able to store on your hadoop cluster if it is has 12 nodes with 4TB raw diskspace per node allocated to HDFS storage?

A) Approximately 3TB
B) Approximately 48TB
C) Approximately 12TB
D) Approximately 16TB

2. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster running MapReduce v1 (MRv1):

A) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
B) The NameNode requires more memory and no disk drives.
C) The NameNode requires less memory and less disk capacity than the DataNodes.
D) The NameNode and DataNodes should the same hardware configuration.
E) The NameNode requires more memory but less disk capacity.

3. 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) $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
C) $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
D) $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/

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

5. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Application B can read 256MB of the file
B) Client application B must wait until the entire file has been written, and will then read its entire contents.
C) Client application B returns an error
D) Client application on B can read the 300MB that has been written so far.

Solutions: