Hadoop Streaming Uses the Standard Input and Standard Output Streams

question 5

Multiple Choice

Hadoop streaming uses the standard input and standard output streams as follows:

• A) Hadoop supplies the input to the mapping script-called the mapper. This script reads its input from the standard input stream. The mapper writes its results to the standard output stream.
• B) Hadoop supplies the mapper's output as the input to the reduction script-called the reducer-which reads from the standard input stream.
• C) The reducer writes its results to the standard output stream. Hadoop writes the reducer's output to the Hadoop file system (HDFS).
• D) All of the above statements are true.

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