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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You set the value of dfs.block.size to 64MB in hdfs-site.xml on a client machine, but you set the same property to 128MB on your clusters name node. What happens when the client writes a file to HDFS?

A) A block size of 128MB will be used
B) A block size of 64MB will be used
C) The file will be written successfully with a block size of 64MB but client attempting to read the file will fail because the namenode believes the blocks to be 128MB in size
D) An execution will be thrown when the client attempts to write the file, because the values are different.

2. Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

A) The change is written to the NameNode disk.
B) Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
C) The change is written to the edits file.
D) The metadata in RAM on the NameNode is flushed disk.
E) The metadata in RAM on the NameNode is updated.
F) The metadata in the RAM on the NameNode is flushed to disk.

3. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
B) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
C) Reducers don't write blocks into HDFS
D) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.

4. 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 33 TB
B) Approximately 100TB
C) Approximately 25TB
D) Approximately 10TB

5. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) The third Initial block will be 44 MB
B) The third block will be 64MB
C) Each block will be replicated nine times
D) All three blocks will be 128MB
E) Two of the initial blocks will be 128MB
F) Each block will be replicated three times
G) The file will consume 1152MB of space in the cluster
H) The file will be split into three blocks when initially written into the cluster

Solutions: