Online Hadoop MapReduce Test – Practice For Hadoop Interview

In MapReduce output of Mapper is stored on

Which of the following is true about combiner

Which of the following is called Mini-reduce

By default RecordReader uses which InputFormat for converting data into key-value pairs.

What statement is true about InputSplit?

Which of the following is not an input format in Hadoop?

In which InputFormat tab character (‘/t’) is used

Aggregation cannot be done in Mapper in MapReduce

Shuffling and sorting phase in Hadoop occurs

What is the correct sequence of data flow in MapReduce
a. InputFormat

b. Shuffling-Sorting

c. Mapper

d. Reducer

e. OutputFormat

Which among the following is true about SequenceFileInputFormat

Suppose file content is- “on the top of the Tree” then, what is key and value?

Which among following is true about KeyValueTextInputFormat

Which is key and value in TextInputFormat

Counters validate that:

Which of the following is Built-In Counters in Hadoop?

Which of the following command is used to set the number of reducers for the job

Which of the following is not an output format in Hadoop?

Which of the following OutputFormat is used for writing to relational databases and Hbase?

RecordReader handle record boundaries in Text files or Sequence files in MapReduce