HADOOP-PR000007 試験問題を無料オンラインアクセス

You've written a MapReduce job that will process 500 million input records and generated 500 million
key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant
amount of intermediate data that it needs to transfer between mappers and reduces which is a potential
bottleneck. A custom implementation of which interface is most likely to reduce the amount of
intermediate data transferred across the network?

• A.Partitioner
• B.WritableComparable
• C.Combiner
• D.InputFormat
• E.OutputFormat
• F.Writable

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

What does Pig provide to the overall Hadoop solution?

• A.Database table and storage management services
• B.Legacy language Integration with MapReduce framework
• C.C++ interface to MapReduce and data warehouse infrastructure
• D.Simple scripting language for writing MapReduce programs

Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application containers and
monitoring application resource usage?

• A.JobTracker
• B.ResourceManager
• C.TaskTracker
• D.NodeManager
• E.ApplicationMasterService
• F.ApplicationMaster

You wrote a map function that throws a runtime exception when it encounters a control character in input
data. The input supplied to your mapper contains twelve such characters totals, spread across five file
splits. The first four file splits each have two control characters and the last split has four control
characters.
Indentify the number of failed task attempts you can expect when you run the job with
mapred.max.map.attempts set to 4:

• A.You will have forty-eight failed task attempts
• B.You will have five failed task attempts
• C.You will have twenty failed task attempts
• D.You will have twelve failed task attempts
• E.You will have seventeen failed task attempts