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Cloudera CCD-333 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| MapReduce Design and Development | 35% | - Job configuration and optimization - Input/output formats and data serialization - MapReduce workflow and execution - Mappers, reducers, combiners, partitioners |
| Hadoop Ecosystem Tools | 25% | - Apache Pig and data flow scripting - Sqoop and Flume for data ingestion - Apache Hive and data warehousing - Oozie workflow scheduling |
| Hadoop Architecture and HDFS | 25% | - Data access, replication, and consistency - HDFS components and design - HDFS API usage |
| Best Practices and Optimization | 15% | - Scalability and fault tolerance - Debugging and error handling - Performance tuning |
Cloudera Certified Developer for Apache Hadoop Sample Questions:
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. 640
- C. 100
- D. 64
Correct Answer: A 🗳️
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Which of the following statements best describes how a large (100 GB) file is stored in HDFS?
- A. The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default. Multiple blocks from the same file might reside on the same datanode.
- B. The file is replicated three times by default. Eachcopy of the file is stored on a separate datanodes.
- C. The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.
- D. The master copy of the file is stored on a single datanode. The replica copies are divided into fixed-size blocks, which are stored on multiple datanodes.
- E. The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default.HDFS guarantees that different blocks from the same file are never on the same datanode.
Correct Answer: E 🗳️
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What is a Writable?
- A. Writable is an interface that all keys and values in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
- B. Writable is an interface that all keys, but not values, in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
- C. Writable is an abstract class that all keys and values in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves
- D. Writable is an abstract class that all keys, but not values, in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves.
Correct Answer: A 🗳️
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In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:
- A. Returns a reference to a different Writable object each time.
- B. Returns a reference to the same writable object each time, but populated with different data.
- C. 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.
- D. Returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
- E. Returns a reference to a Writable object from an object pool.
Correct Answer: B 🗳️
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You need to import a portion of a relational database every day as files to HDFS, and generate Java classes to Interact with your imported data. Which of the following tools should you use to accomplish this?
- A. Sqoop
- B. Flume
- C. Pig
- D. fuse-dfs
- E. Hive
- F. Hue
- G. Oozie
Correct Answer: A 🗳️
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