Package org.apache.flink.streaming.examples.wordcount

Class WordCount

java.lang.Object

org.apache.flink.streaming.examples.wordcount.WordCount

public class WordCount
extends Object

Implements the "WordCount" program that computes a simple word occurrence histogram over text files. This Job can be executed in both streaming and batch execution modes.

The input is a [list of] plain text file[s] with lines separated by a newline character.

Usage:

• --input <path>A list of input files and / or directories to read. If no input is provided, the program is run with default data from WordCountData.
• --discovery-interval <duration>Turns the file reader into a continuous source that will monitor the provided input directories every interval and read any new files.
• --output <path>The output directory where the Job will write the results. If no output path is provided, the Job will print the results to stdout .
• --execution-mode <mode>The execution mode (BATCH, STREAMING, or AUTOMATIC) of this pipeline.
• --async-state Whether enable async state.

This example shows how to:

• Write a simple Flink DataStream program
• Use tuple data types
• Write and use a user-defined function

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	WordCount.Tokenizer	Implements the string tokenizer that splits sentences into words as a user-defined FlatMapFunction.

Constructor Summary

Constructors

Constructor	Description
WordCount()

Method Summary

Modifier and Type	Method	Description
static void	main(String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

WordCount

public WordCount()

Method Details

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception