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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which two of the following are valid statements? (Choose two)

A) HDFS is optimized for storing a large number of files smaller than the HDFS block size.
B) HDFS has the Characteristic of supporting a "write once, read many" data access model.
C) HDFS is a distributed file system that runs on top of native OS filesystems and is well suited to storage of very large data sets.
D) HDFS is a distributed file system that replaces ext3 or ext4 on Linux nodes in a Hadoop cluster.

2. Given a Mapper, Reducer, and Driver class packaged into a jar, which is the correct way of submitting the job to the cluster?

A) jar MyJar.jar MyDriverClass inputdir outputdir
B) jar MyJar.jar
C) hadoop jar MyJar.jar MyDriverClass inputdir outputdir
D) hadoop jar class MyJar.jar MyDriverClass inputdir outputdir

3. To process input key-value pairs, your mapper needs to load a 512 MB data file in memory. What is the best way to accomplish this?

A) Place the datafile in the DataCache and read the data into memory in the configure method ofthe mapper.
B) Place the data file in theDistributedCacheand read the data into memory in the map method of the mapper.
C) Serialize the data file, insert it in the Jobconf object, and read the data into memory in the configure method of the mapper.
D) Place the data file in theDistributedCacheand read the data into memory in the configure method of the mapper.

4. Which MapReduce daemon runs on each slave node and participates in job execution?

A) JobTracker
B) Secondary NameNode
C) NameNode
D) TaskTracker

5. You are running a job that will process a single InputSplit on a cluster which has no other jobs currently running. Each node has an equal number of open Map slots. On which node will Hadoop first attempt to run the Map task?

A) The node on which this InputSplit is stored
B) The node with the most memory
C) The node with the lowest system load
D) The node with the most free local disk space

Solutions: