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

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

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

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

A) Receives the same block reports as 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) Runs on the same machine and shares the memory of the active NameNode.

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

A) n
B) mXn (i.e., m multiplied by n)
C) mn (i.e., m to the power of n)
D) m+n (i.e., m plus n)
E) m

4. When is the earliest point at which the reduce method of a given Reducer can be called?

A) As soon as at least one mapper has finished processing its input split.
B) Not until all mappers have finished processing all records.
C) As soon as a mapper has emitted at least one record.
D) It depends on the InputFormat used for the job.

5. Which describes how a client reads a file from HDFS?

A) The client queries the NameNode for the block location(s). The NameNode returns the block location(s)
to the client. The client reads the data directory off the DataNode(s).
B) The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode
that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then
from the NameNode to the client.
C) The client contacts the NameNode for the block location(s). The NameNode then queries the
DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode redirects
the client to the DataNode that holds the requested data block(s). The client then reads the data directly
off the DataNode.
D) The client queries all DataNodes in parallel. The DataNode that contains the requested data responds
directly to the client. The client reads the data directly off the DataNode.

Solutions: