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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. 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.

2. You want to Ingest log files Into HDFS, which tool would you use?

A) Sqoop
B) HCatalog
C) Flume
D) Ambari

3. For each intermediate key, each reducer task can emit:

A) One final key-value pair per key; no restrictions on the type.
B) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
C) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
D) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.
E) One final key-value pair per value associated with the key; no restrictions on the type.

4. Which one of the following classes would a Pig command use to store data in a table defined in HCatalog?

A) org.apache.hcatalog.pig.HCatStorer
B) No special class is needed for a Pig script to store data in an HCatalog table
C) Pig scripts cannot use an HCatalog table
D) org.apache.hcatalog.pig.HCatOutputFormat

5. Which one of the following statements is FALSE regarding the communication between DataNodes and a federation of NameNodes in Hadoop 2.0?

A) DataNodes send periodic heartbeats to all the NameNodes.
B) Each DataNode registers with all the NameNodes.
C) Each DataNode receives commands from one designated master NameNode.
D) DataNodes send periodic block reports to all the NameNodes.

Solutions: