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Cloudera Certified Developer for Apache Hadoop Sample Questions:

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

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

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

3. Custom programmer-defined counters in MapReduce are:

A) Lightweight devices for bookkeeping within MapReduce programs.
B) Lightweight devices for ensuring the correctness of a MapReduce program. Mappers Increment counters, and reducers decrement counters. If at the end of the program the counters read zero, then you are sure that the job completed correctly.
C) Lightweight devices for synchronization within MapReduce programs. You can use counters to coordinate execution between a mapper and a reducer.

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

A) 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.
B) 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.
C) 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.
D) The file is replicated three times by default. Eachcopy of the file is stored on a separate datanodes.
E) The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.

5. All keys used for intermediate output from mappers must do which of the following:

A) Be compressed using a splittable compression algorithm.
B) Implement WritableComparable
C) Override isSplitable
D) Be a subclass of Filelnput-Format
E) Use a comparator for speedy sorting

Solutions: