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

1. For each input key-value pair, mappers can emit:

A) As many intermediate key-value pairs as designed, as long as all the keys have the same types and all
the values have the same type.
B) One intermediate key-value pair, but of the same type.
C) As many intermediate key-value pairs as designed. There are no restrictions on the types of those
key-value pairs (i.e., they can be heterogeneous).
D) As many intermediate key-value pairs as designed, but they cannot be of the same type as the input
key-value pair.
E) One intermediate key-value pair, of a different type.

2. Your cluster's HDFS block size in 64MB. You have directory containing 100 plain text files, each of which
is 100MB in size. The InputFormat for your job is TextInputFormat. Determine how many Mappers will
run?

A) 640
B) 64
C) 200
D) 100

3. You need to run the same job many times with minor variations. Rather than hardcoding all job
configuration options in your drive code, you've decided to have your Driver subclass
org.apache.hadoop.conf.Configured and implement the org.apache.hadoop.util.Tool interface.
Indentify which invocation correctly passes.mapred.job.name with a value of Example to Hadoop?

A) hadoop "mapred.job.name=Example" MyDriver input output
B) hadoop MyDriver mapred.job.name=Example input output
C) hadoop MyDrive -D mapred.job.name=Example input output
D) hadoop setproperty mapred.job.name=Example MyDriver input output
E) hadoop setproperty ("mapred.job.name=Example") MyDriver input output

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

A) 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.
B) 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.
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. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The contents of File1 are parsed as comma-delimited rows and stored in a database
B) The contents of File1 are parsed as comma-delimited rows and loaded into /user/joe/x/
C) The file named File1 is moved to to/user/joe/x/
D) Hive reformats File1 into a structure that Hive can access and moves into to/user/joe/x/

Solutions: