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Cloudera CCD-333 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Hadoop Ecosystem Tools | 25% | - Oozie workflow scheduling - Apache Pig and data flow scripting - Apache Hive and data warehousing - Sqoop and Flume for data ingestion |
| Topic 2: MapReduce Design and Development | 35% | - Job configuration and optimization - Mappers, reducers, combiners, partitioners - MapReduce workflow and execution - Input/output formats and data serialization |
| Topic 3: Best Practices and Optimization | 15% | - Debugging and error handling - Scalability and fault tolerance - Performance tuning |
| Topic 4: Hadoop Architecture and HDFS | 25% | - HDFS API usage - Data access, replication, and consistency - HDFS components and design |
Cloudera Certified Developer for Apache Hadoop Sample Questions:
Which MapReduce daemon runs on each slave node and participates in job execution?
- A. NameNode
- B. JobTracker
- C. Secondary NameNode
- D. TaskTracker
Correct Answer: D 🗳️
Explanation: Only visible for PassSureExam members. You can sign-up / login (it's free).
Which happens if the NameNode crashes?
- A. HDFS becomes unavailable until the NameNode is restored.
- B. HDFS becomes temporarily unavailable until an administrator starts redirecting client requests to the Secondary NameNode.
- C. HDFS becomes unavailable to new MapReduce jobs, but running jobs will continue until completion.
- D. The Secondary NameNode seamlessly takes over and there is no service interruption.
Correct Answer: A 🗳️
Explanation: Only visible for PassSureExam members. You can sign-up / login (it's free).
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.HDFS guarantees that different blocks from the same file are never on the same datanode.
- B. 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.
- C. 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.
- D. The file is replicated three times by default. Eachcopy of the file is stored on a separate datanodes.
- E. The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.
Correct Answer: A 🗳️
Explanation: Only visible for PassSureExam members. You can sign-up / login (it's free).
Does the MapReduce programming model provide a way for reducers to communicate with each other?
- A. No, each reducer runs independently and in isolation.
- B. Yes, reducers can communicate with each other by dispatching intermediate key value pairs that get shuffled to another reduce
- C. Yes, all reducers can communicate with each other by passing information through the jobconf object.
- D. Yes, reducers running on the same machine can communicate with each other through shared memory, but not reducers on different machines.
Correct Answer: A 🗳️
Explanation: Only visible for PassSureExam members. You can sign-up / login (it's free).
Which statement best describes the data path of intermediate key-value pairs (i.e., output of the mappers)?
- A. Intermediate key-value pairs are written to the local disks of the machines running the map tasks, and then copied to the machine running the reduce tasks.
- B. Intermediate key-value pairs are written to HDFS. Reducers read the intermediate data from HDFS.
- C. Intermediate key-value pairs are written to the local disks of the machines running the map tasks, and are then copied to HDFS. Reducers read the intermediate data from HDFS.
- D. Intermediate key-value pairs are written to HDFS. Reducers copy the intermediate data to the local disks of the machines running the reduce tasks.
Correct Answer: A 🗳️
Explanation: Only visible for PassSureExam members. You can sign-up / login (it's free).
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