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

1. A client application creates an HDFS file named foo.txt with a replication factor of 3. Identify which best
describes the file access rules in HDFS if the file has a single block that is stored on data nodes A, B and
C?

A) The file will be marked as corrupted if data node B fails during the creation of the file.
B) Each data node stores a copy of the file in the local file system with the same name as the HDFS file.
C) Each data node locks the local file to prohibit concurrent readers and writers of the file.
D) The file can be accessed if at least one of the data nodes storing the file is available.

2. What is a SequenceFile?

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

3. You have user profile records in your OLPT database, that you want to join with web logs you have
already ingested into the Hadoop file system. How will you obtain these user records?

A) Sqoop import
B) Ingest with Flume agents
C) Ingest with Hadoop Streaming
D) HDFS command
E) Hive LOAD DATA command
F) Pig LOAD command

4. To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the
best way to accomplish this?

A) Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure
method of the mapper.
B) Place the data file in the DistributedCache and read the data into memory in the configure method of
the mapper.
C) Place the data file in the DistributedCache and read the data into memory in the map method of the
mapper.
D) Place the data file in the DataCache and read the data into memory in the configure method of the
mapper.

5. Which HDFS command displays the contents of the file x in the user's HDFS home directory?

A) hadoop fs -cp x
B) hdfs fs -get x
C) hadoop fs -Is x
D) hadoop fs -cat x

Solutions: