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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. What is the behavior of the default partitioner?

A) The default partitioner computes the hash of the key. Hash values between specific ranges are associated with different buckets, and each bucket is assigned to a specific reducer.
B) The default partitioner implements a round robin strategy, shuffling the key value pairs to each reducer in turn. This ensures an even partition of the key space.
C) The default partitioner computes the hash of the key and divides that value modulo the number of reducers. The result determines the reducer assigned to process the key-value pair.
D) The default partitioner assigns key value pairs to reducers based on an internal random number generator.
E) The default partitioner computes the hash of the value and takes the mod of that value with the number of reducers. The result determines the reducer assigned to process the key value pair.

2. 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 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.
B) 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).
C) 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.
D) 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.

3. Which of the Following best describes the lifecycle of a Mapper?

A) The JobTracker spawns a new Mapper to process all records in a single file.
B) The JobTracker calls the FastTracker's configure () method, then its map () method and finally its closer ()
C) The TaskTracker spawns a new Mapper to process each key-value pair.
D) The TaskTracker spawns a new Mapper to process all records in a single input split.

4. What is the standard configuration of slave nodes in a Hadoop cluster?

A) Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.
B) Each slave node runs a TaskTracker and a DataNode daemon.
C) Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
D) Each slave node either runs a TaskTracker or a DataNode daemon, but not both.
E) Each slave node runs a JobTracker and a DataNode daemon.

5. MapReduce is well-suited for all of the following applications EXCEPT? (Choose one):

A) Graph mining on a large social network (e.g., Facebook friends network).
B) Text mining on a large collections of unstructured documents.
C) Analysis of large amounts of Web logs (queries, clicks, etc.).
D) Online transaction processing (OLTP) for an e-commerce Website.

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