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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. In Hadoop 2.0, which one of the following statements is true about a standby NameNode?
The Standby NameNode:

A) Runs on the same machine and shares the memory of the active NameNode.
B) Communicates directly with the active NameNode to maintain the state of the active NameNode.
C) Processes all client requests and block reports from the appropriate DataNodes.
D) Receives the same block reports as the active NameNode.

2. What data does a Reducer reduce method process? Reference: Yahoo! Hadoop Tutorial, Module 4:
MapReduce

A) All data produced by a single mapper.
B) All data for a given value, regardless of which mapper(s) produced it.
C) All data for a given key, regardless of which mapper(s) produced it.
D) All the data in a single input file.

3. A NameNode in Hadoop 2.0 manages ______________.

A) An arbitrary number of namespaces
B) Two namespaces: an active namespace and a backup namespace
C) No namespaces
D) A single namespace

4. In Hadoop 2.0, which TWO of the following processes work together to provide automatic failover of the
NameNode? Choose 2 answers

A) JournalNode
B) ZKFailoverController
C) ZooKeeper
D) QuorumManager

5. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

A) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
B) Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
C) Keys are presented to reducer in sorted order; values for a given key are not sorted.
D) Keys are presented to a reducer in random order; values for a given key are not sorted.

Solutions: