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

1. You use the hadoop fs -put command to write a 300 MB file using and HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this life?

A) They would see no content until the whole file written and closed.
B) They would see the current state of the file, up to the last bit written by the command.
C) They would see the current of the file through the last completed block.
D) They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file.

2. What is the disadvantage of using multiple reducers with the default HashPartitioner and distributing your workload across you cluster?

A) You will not be able to compress the intermediate data.
B) By using multiple reducers with the default HashPartitioner, output files may not be in globally sorted order.
C) There are no concerns with this approach. It is always advisable to use multiple reduces.
D) You will longer be able to take advantage of a Combiner.

3. A NameNode in Hadoop 2.0 manages ______________.

A) An arbitrary number of namespaces
B) No namespaces
C) A single namespace
D) Two namespaces: an active namespace and a backup namespace

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. Given the following Hive command:

Which one of the following statements is true?

A) The files in the mydata folder are moved to a subfolder of /apps/hive/wa re house
B) The files in the mydata folder are copied into Hive's underlying relational database
C) The files in the mydata folder are copied to a subfolder of /apps/hlve/warehouse
D) The files in the mydata folder do not move from their current location In HDFS

Solutions: