Cloudera Hadoop Developer Certification Questions and Answer (Dumps and Practice Questions)

Question :

The size of block in HDFS is

1. 512 Bytes
2. 64 MB
3. 1024 KB
4. None of the above



Correct Answer : Get Lastest Questions and Answer :

The Default File Block Size in HDFS is 64MB .





Question :

To Create Sequence of Multiple MapReduce job (Chaining) same JobConf object is used

1. True
2. False

Correct Answer : Get Lastest Questions and Answer :

To chain multiple MapReduce job, the driver at each job will have to create a new JobConf object
and needs to set input path to be the output path of previos job.




Question :

Which class/object represent a MapReduce job

1. Job
2. JobControl
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Correct Answer : Get Lastest Questions and Answer :

Job object represent the actual Job and JobControl object do the managing and monitoring of the Job,
While JobConf object the configuration related to job like input path and output path.

Related Questions

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Question :

Given a directory of files with the following structure: line number, tab character, string: Example:
1. AvilakaurKohni
2. Decemberandaugust
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You want to send each line as one record to your Mapper.
Which InputFormat would you use to complete the line: setInputFormat (________.class);


1. BDBInputFormat
2. KeyValueTextInputFormat
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4. SequenceFileAsTextInputFormat


Question :

What is a SequenceFile?


1. A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
2. A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
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4. A SequenceFile contains a binary encoding of an arbitrary number key-value pairs.
Each key must be the same type. Each value must be same type.






1. A
2. B
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4. D




">
1. A
2. B
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4. D
5. E




Question :
How do you differentiate between failed task and killed task



1. A
2. B
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4. D


Question :

Using combiner you can reduce...


1. The number of values across different keys in the iterator supplied to a single reduce method call.
2. The amount of intermediate data that must be transfrred between the mapper and reducer.
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4. The number of output files a reducer must produce.