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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Definitions:

ADH

Antidiuretic hormone, involved in regulating water balance in the body by increasing the concentration of water in the blood.

Collecting Duct

A tube-like structure in the kidney nephrons responsible for the final modification of urine and its concentration by reabsorbing water.

Permeability

The capacity of a material or membrane to allow fluids or gases to pass through it.

Glomerular Filtrate

The fluid that is filtered from the blood through the glomeruli into the Bowman's capsule in the kidneys, initiating urine formation.