Cloudera Certified Developer for Apache Hadoop 認定 CCD-333 試験問題:
1. Which of the following best describes the workings of TextInputFormat?
A) The input file is split exactly at the line breaks, so each Record Reader will read a series of complete lines.
B) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.
C) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.
D) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.
E) Input file splits may cross line breaks. A line that crosses tile splits is ignored.
2. Which of the following best describes the map method input and output?
A) It accepts a single key-value pair as input and can emit any number of key-value pairs as output, including zero.
B) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output
C) It accepts a list of key-value pairs as input hut run emit only one key value pair as output.
D) It accepts a single key-value pair as input and can emit only one key-value pair as output.
3. 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 with the lowest system load
B) The node with the most memory
C) The node with the most free local disk space
D) The node on which this InputSplit is stored
4. In a MapReduce job, you want each of you input files processed by a single map task. How do you configure a MapReduce job so that a single map task processes each input file regardless of how many blocks the input file occupies?
A) Write a custom MapRunner that iterates over all key-value pairs in the entire file.
B) Set the number of mappers equal to the number of input files you want to process.
C) Write a custom FileInputFormat and override the method isSplittable to always return false.
D) Increase the parameter that controls minimum split size in the job configuration.
5. All keys used for intermediate output from mappers must do which of the following:
A) Be compressed using a splittable compression algorithm.
B) Use a comparator for speedy sorting
C) Be a subclass of Filelnput-Format
D) Override isSplitable
E) Implement WritableComparable
質問と回答：
| 質問 # 1 正解： B | 質問 # 2 正解： A | 質問 # 3 正解： D | 質問 # 4 正解： C | 質問 # 5 正解： E |
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