Package org.apache.storm.starter.streams

Class StatefulWordCount

java.lang.Object

org.apache.storm.starter.streams.StatefulWordCount

public class StatefulWordCount
extends Object

A stateful word count that uses PairStream.updateStateByKey(StateUpdater) to save the counts in a key value state. This example uses Redis state store.

You should start a local redis instance before running the 'storm jar' command. By default the connection will be attempted at localhost:6379. The default RedisKeyValueStateProvider parameters can be overridden in conf/storm.yaml, for e.g.

 topology.state.provider.config: '{"keyClass":"...", "valueClass":"...",
  "keySerializerClass":"...", "valueSerializerClass":"...",
  "jedisPoolConfig":{"host":"localhost", "port":6379,
  "timeout":2000, "database":0, "password":"xyz"}}'
 

Constructor Summary

Constructors

Constructor	Description
StatefulWordCount()

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

StatefulWordCount

public StatefulWordCount()

Method Details

main

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

Throws:

Exception