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Cloudera Certified Developer for Apache Hadoop: CCD-333 Exam
"Cloudera Certified Developer for Apache Hadoop", also known as CCD-333 exam, is a Cloudera Certification. With the complete collection of questions and answers, BraindumpsPass has assembled to take you through 60 Q&As to your CCD-333 Exam preparation. In the CCD-333 exam resources, you will cover every field and category in CCDH Certification helping to ready you for your successful Cloudera Certification.
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Cloudera CCD-333 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Hadoop Ecosystem and Architecture | - Hadoop Distributed File System (HDFS)
|
| Topic 2: Data Ingestion and Integration | - Flume
|
| Topic 3: Workflow and Scheduling | - Oozie
|
| Topic 4: Data Processing Tools | - Hive
|
| Topic 5: Data Processing with MapReduce | - MapReduce programming model
|
| Topic 6: Data Formats and Storage | - Serialization formats
|
Cloudera Certified Developer for Apache Hadoop Sample Questions:
Does the MapReduce programming model provide a way for reducers to communicate with each other?
- A. Yes, reducers can communicate with each other by dispatching intermediate key value pairs that get shuffled to another reduce
- B. Yes, reducers running on the same machine can communicate with each other through shared memory, but not reducers on different machines.
- C. No, each reducer runs independently and in isolation.
- D. Yes, all reducers can communicate with each other by passing information through the jobconf object.
Answer: C
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You need to create a job that does frequency analysis on input data. You will do this by writing a Mapper that uses TextInputForma and splits each value (a line of text from an input file) into individual characters. For each one of these characters, you will emit the character as a key and as IntWritable as the value. Since this will produce proportionally more intermediate data than input data, which resources could you expect to be likely bottlenecks?
- A. Processor and network I/O
- B. Processor and RAM
- C. Disk I/O and network I/O
- D. Processor and disk I/O
Answer: D
When is the reduce method first called in a MapReduce job?
- A. Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called only after all intermediate data has been copied and sorted.
- B. Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The programmer can configure in the job what percentage of the intermediate data should arrive before the reduce method begins.
- C. Reducers start copying intermediate key value pairs from each Mapper as soon as it has completed. The reduce method is called as soon as the intermediate key-value pairs start to arrive.
- D. Reduce methods and map methods all start at the beginning of a job, in order to provide optimal performance for map-only or reduce-only jobs.
Answer: A
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You write a MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses TextInputFormat and the IdentityReducer: the mapper applies a regular expression over input values and emits key-value pairs with the key consisting of the matching text, and the value containing the filename and byte offset. Determine the difference between setting the number of reducers to zero.
- A. There is no difference in output between the two settings.
- B. With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one reducer, all instances of matching patterns are gathered together in one file on HDFS.
- C. With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With one reducer, instances of matching patterns stored in multiple files on HDFS.
- D. With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of matching patterns are stored in a single file on HDFS.
Answer: B
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Which of the following statements best describes how a large (100 GB) file is stored in HDFS?
- A. 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.
- B. The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.
- C. 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.
- 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 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.
Answer: E
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