Difference between revisions of "Windbag MapReduce Application"
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A simple Mapper and two simple Collectors reinforce our understanding of how pieces of the MapReduce puzzle can be reused. Further, we will reduce the value type of Boolean to both an Integer and a Double in two different Collectors. | A simple Mapper and two simple Collectors reinforce our understanding of how pieces of the MapReduce puzzle can be reused. Further, we will reduce the value type of Boolean to both an Integer and a Double in two different Collectors. | ||
| − | A windbag is [https://www.merriam-webster.com/dictionary/windbag an exhaustively talkative person]. | + | =Background= |
| + | A windbag is [https://www.merriam-webster.com/dictionary/windbag an exhaustively talkative person]. In this studio we will try to find who is the biggest windbag in [https://en.wikipedia.org/wiki/Hamlet Hamlet]. | ||
| − | |||
[http://shakespeare-online.com/plays/hamlet_1_3.html Polonius' Advice To Laertes] | [http://shakespeare-online.com/plays/hamlet_1_3.html Polonius' Advice To Laertes] | ||
Revision as of 08:09, 7 March 2019
Contents
Motivation
A simple Mapper and two simple Collectors reinforce our understanding of how pieces of the MapReduce puzzle can be reused. Further, we will reduce the value type of Boolean to both an Integer and a Double in two different Collectors.
Background
A windbag is an exhaustively talkative person. In this studio we will try to find who is the biggest windbag in Hamlet.
Code To Implement
| class: | WindbagMapper.java |  |
| methods: | map | |
| package: | mapreduce.apps.windbag.studio | |
| source folder: | student/src/main/java |
method: public void map(PlayLine item, BiConsumer<PlayRole, Boolean> keyValuePairConsumer) 
(sequential implementation only)
| class: | TrueCountClassicReducer.java | |
| methods: | finisher | |
| package: | mapreduce.apps.windbag.studio | |
| source folder: | student/src/main/java |
method: public Function<List<Boolean>, Integer> finisher() (sequential implementation only)
 Warning:This class inherits from ClassicReducer. Be sure to have completed that studio first. |
| class: | TruePortionClassicReducer.java | |
| methods: | finisher | |
| package: | mapreduce.apps.windbag.studio | |
| source folder: | student/src/main/java |
method: public Function<List<Boolean>, Double> finisher() (sequential implementation only)
| Warning:This class inherits from ClassicReducer. Be sure to have completed that studio first. |
Testing Your Solution
Correctness
| class: | WindbagStudioTestSuite.java |  |
| package: | mapreduce | |
| source folder: | testing/src/test/java |
Output
WindbagApp
COUNT
===========================
HAMLET: 27
KING: 14
POLONIUS: 7
HORATIO: 5
OPHELIA: 2
GHOST: 2
FIRST PLAYER: 2
LAERTES: 1
ROSENCRANTZ: 1
VOLTEMAND: 1
PLAYER KING: 1
GENTLEMAN: 1
PLAYER QUEEN: 1
QUEEN: 1
PORTION
===========================
VOLTEMAND: 1.000000
GENTLEMAN: 0.333333
PLAYER KING: 0.250000
FIRST PLAYER: 0.250000
PLAYER QUEEN: 0.200000
GHOST: 0.142857
KING: 0.137255
POLONIUS: 0.081395
HAMLET: 0.075419
HORATIO: 0.046729
OPHELIA: 0.034483
ROSENCRANTZ: 0.022222
LAERTES: 0.016129
QUEEN: 0.014493
