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

1. Given the following Pig commands:

Which one of the following statements is true?

A) The grouped relation is not valid
B) The $1 variable represents the first column of data in 'my.log'
C) The $1 variable represents the second column of data in 'my.log'
D) The severe relation is not valid

2. Indentify which best defines a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be
the same type. Each value must be the same type.
B) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous Writable objects
C) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in
sorted order.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects

3. Table metadata in Hive is:

A) Stored in the Metastore.
B) Stored in ZooKeeper.
C) Stored as metadata on the NameNode.
D) Stored along with the data in HDFS.

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

A) 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.
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 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).
D) 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.

5. You wrote a map function that throws a runtime exception when it encounters a control character in input
data. The input supplied to your mapper contains twelve such characters totals, spread across five file
splits. The first four file splits each have two control characters and the last split has four control
characters.
Indentify the number of failed task attempts you can expect when you run the job with
mapred.max.map.attempts set to 4:

A) You will have five failed task attempts
B) You will have twenty failed task attempts
C) You will have forty-eight failed task attempts
D) You will have seventeen failed task attempts
E) You will have twelve failed task attempts

Solutions: