Online Access Free HDPCD Exam Questions

Which of the following tool was designed to import data from a relational database into HDFS?

• A.Flume
• B.Ambari
• C.Sqoop
• D.HCatalog

You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

• A.None, the directory cannot be named jobdata
• B.Three, the pound sign is an invalid character for HDFS file names
• C.Two, file names with a leading period or underscore are ignored
• D.Four, all files will be processed
• E.One, no special characters can prefix the name of an input file

Consider the following two relations, A and B.

What is the output of the following Pig commands?
X = GROUP A BY S1; DUMP X;

• A.Option C
• B.Option D
• C.Option A
• D.Option B

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

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

When is the earliest point at which the reduce method of a given Reducer can be called?

• A.As soon as a mapper has emitted at least one record.
• B.Not until all mappers have finished processing all records.
• C.It depends on the InputFormat used for the job.
• D.As soon as at least one mapper has finished processing its input split.