最新のApache-Hadoop-Developer問題集で試験を準備する

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

Which one of the following statements describes a Pig bag. tuple, and map, respectively?

• A. Ordered set of fields, ordered collection of tuples, ordered collection of maps
• B. Ordered collection of maps, ordered collection of bags, and unordered set of key/value pairs
• C. Unordered collection of maps, ordered collection of tuples, ordered set of key/value pairs
• D. Unordered collection of tuples, ordered set of fields, set of key value pairs

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 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.
• C. 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.
• D. 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.

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

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. org.apache.hcatalog.pig.HCatOutputFormat
• D. Pig scripts cannot use an HCatalog table