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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Workflows expressed in Oozie can contain:

A) Sequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins.
B) Sequences of MapReduce jobs only; no Pig or Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.
C) Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks.
D) Iterative repetition of MapReduce jobs until a desired answer or state is reached.

2. You need a distributed, scalable, data Store that allows you random, realtime read/write access to hundreds of terabytes of data. Which of the following would you use?

A) HBase
B) Sqoop
C) Hive
D) Pig
E) Hue
F) Oozie
G) Flume

3. When is the reduce method first called in a MapReduce job?

A) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called only after all intermediate data has been copied and sorted.
B) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The programmer can configure in the job what percentage of the intermediate data should arrive before the reduce method begins.
C) Reduce methods and map methods all start at the beginning of a job, in order to provide optimal performance for map-only or reduce-only jobs.
D) Reducers start copying intermediate key value pairs from each Mapper as soon as it has completed. The reduce method is called as soon as the intermediate key-value pairs start to arrive.

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

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

5. MapReduce is well-suited for all of the following applications EXCEPT? (Choose one):

A) Analysis of large amounts of Web logs (queries, clicks, etc.).
B) Text mining on a large collections of unstructured documents.
C) Graph mining on a large social network (e.g., Facebook friends network).
D) Online transaction processing (OLTP) for an e-commerce Website.

Solutions: