HDPCD 試験問題を無料オンラインアクセス

You want to perform analysis on a large collection of images. You want to store this data in HDFS and process it with MapReduce but you also want to give your data analysts and data scientists the ability to process the data directly from HDFS with an interpreted high-level programming language like Python. Which format should you use to store this data in HDFS?

• A.Avro
• B.XML
• C.SequenceFiles
• D.JSON
• E.HTML
• F.CSV

MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate daemons? Select two.

• A.Resource management
• B.Launching tasks
• C.Heath states checks (heartbeats)
• D.Managing file system metadata
• E.Job scheduling/monitoring
• F.Managing tasks
• G.MapReduce metric reporting
• H.Job coordination between the ResourceManager and NodeManager

Which HDFS command uploads a local file X into an existing HDFS directory Y?

• A.hadoop scp X Y
• B.hadoop fs-put X Y
• C.hadoop fs -localPut X Y
• D.hadoop fs -get X Y

A combiner reduces:

• A.The amount of intermediate data that must be transferred between the mapper and reducer.
• B.The number of output files a reducer must produce.
• C.The number of input files a mapper must process.
• D.The number of values across different keys in the iterator supplied to a single reduce method call.

On a cluster running MapReduce v1 (MRv1), a TaskTracker heartbeats into the JobTracker on your cluster, and alerts the JobTracker it has an open map task slot.
What determines how the JobTracker assigns each map task to a TaskTracker?

• A.The amount of RAM installed on the TaskTracker node.
• B.The amount of free disk space on the TaskTracker node.
• C.The location of the InsputSplit to be processed in relation to the location of the node.
• D.The number and speed of CPU cores on the TaskTracker node.
• E.The average system load on the TaskTracker node over the past fifteen (15) minutes.