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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How many Mappers will run?

A) 200
B) 640
C) 64
D) 100

2. You need to create a GUI application to help your company's sales people add and edit customer information. Would HDFS be appropriate for this customer information file?

A) No, because HDFS is optimized for write-once, streaming access for relatively large files.
B) Yes, because HDFS is optimized for fast retrieval of relatively small amounts of data.
C) Yes, because HDFS is optimized for random access writes.
D) No, because HDFS can only be accessed by MapReduce applications.

3. Which of the following statements best describes how a large (100 GB) file is stored in HDFS?

A) The file is replicated three times by default. Eachcopy of the file is stored on a separate datanodes.
B) The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.
C) The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default.HDFS guarantees that different blocks from the same file are never on the same datanode.
D) The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default. Multiple blocks from the same file might reside on the same datanode.
E) The master copy of the file is stored on a single datanode. The replica copies are divided into fixed-size blocks, which are stored on multiple datanodes.

4. Which of the Following best describes the lifecycle of a Mapper?

A) The JobTracker spawns a new Mapper to process all records in a single file.
B) The TaskTracker spawns a new Mapper to process each key-value pair.
C) The TaskTracker spawns a new Mapper to process all records in a single input split.
D) The JobTracker calls the FastTracker's configure () method, then its map () method and finally its closer ()

5. In a large MapReduce job with m mappers and r reducers, how many distinct copy operations will there be in the sort/shuffle phase?

A) mxr (i.e., m multiplied by r)
B) r
C) m+r (i.e., m plus r)
D) m
E) mr (i.e., m to the power of r)

Solutions: