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Cloudera Certified Developer for Apache Hadoop Sample Questions:
1. Which happens if the NameNode crashes?
A) HDFS becomes unavailable to new MapReduce jobs, but running jobs will continue until completion.
B) HDFS becomes unavailable until the NameNode is restored.
C) HDFS becomes temporarily unavailable until an administrator starts redirecting client requests to the Secondary NameNode.
D) The Secondary NameNode seamlessly takes over and there is no service interruption.
2. 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 TaskTracker spawns a new Mapper to process all records in a single input split.
C) The JobTracker calls the FastTracker's configure () method, then its map () method and finally its closer ()
D) The TaskTracker spawns a new Mapper to process each key-value pair.
3. Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How many Mappers will run?
A) 200
B) 64
C) 640
D) 100
4. What is the difference between a failed task attempt and a killed task attempt?
A) A failed task attempt is a task attempt that threw a RuntimeException (i.e., the task fails). A killed task attempt is a task attempt that threw any other type of exception (e.g., IOException); the execution framework catches these exceptions and reports them as killed.
B) A failed task attempt is a task attempt that did not generate any key value pairs. A killed task attempt is a task attempt that threw an exception, and thus killed by the execution framework.
C) A failed task attempt is a task attempt that completed, but with an unexpected status value. A killed task attempt is a duplicate copy of a task attempt that was started as part of speculative execution.
D) A failed task attempt is a task attempt that threw an unhandled exception. A killed task attempt is one that was terminated by the JobTracker.
5. Your client application submits a MapReduce job to your Hadoop cluster. The Hadoop framework looks for an available slot to schedule the MapReduce operations on which of the following Hadoop computing daemons?
A) DataNode
B) JobTracker
C) Secondary NameNode
D) NameNode
E) TaskTracker
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: D | Question # 3 Answer: A | Question # 4 Answer: C | Question # 5 Answer: B |
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