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Cloudera CCD-333 Exam Syllabus Topics:

Cloudera Certified Developer for Apache Hadoop Sample Questions:

Question 1

Which of the following describes how a client reads a file from HDFS?

A. 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.
B. 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.
C. 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 directly off the DataNode(s).
D. The client contacts the NameNode for the block location(s). The NameNode contacts theDataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.

Question 2

You use the hadoop fs -put command to write a 300 MB file using an 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 file?

A. They would see no content until the whole file is 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 Hadoop throw an concurrentFileAccessException when they try to access this file.
D. They would see the content of the file through the last completed block.

Question 3

In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:

A. Returns a reference to the same writable object if the next value is the same as the previous value, or a new writable object otherwise.
B. Returns a reference to a different Writable object each time.
C. Returns a reference to a Writable object from an object pool.
D. Returns a reference to the same writable object each time, but populated with different data.
E. Returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.

Question 4

For each input key-value pair, mappers can emit:

A. As many intermediate key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
B. One intermediate key value pair, but of the same type.
C. One intermediate key value pair, of a different type.
D. As many intermediate key-value pairs as desired, but they cannot be of the same type as the input key-value pair.
E. As many intermediate key value pairs as desired, as long as all the keys have the same type and all the values have the same type.

Question 5

In a MapReduce job, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?

A. Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
B. The values are arbitrarily ordered, but multiple runs of the same MapReduce job will always have the same ordering.
C. The values are in sorted order.
D. The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

Solutions: