A demo Storm topology for a presentation at the St. Louis Hadoop User Group
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Storm Demo - St. Louis Hadoop User Group

Last updated October 2017.

A word count topology originally forked from the storm-starter project and modified for a St. Louis Hadoop User Group presentation.


  1. RandomSentenceSpout: emits random sentence tuples
  2. SplitSentenceBolt: splits each sentence into word tuples
  3. WordCountBolt: keeps track of counts for each word and emits (word, count) tuples
  4. OutputBolt: LOG the current word and the count
  5. SolrIndexerBolt: Index the current word and the count in Solr


I developed this topology on Windows 10 using the following:

  • IntelliJ Community Edition 2017.2
  • Storm 1.0.5 (local mode)
  • Solr 7.0.1 + Banana ?.?.? (installed separately)

Demo Hints

  1. Start solr with .\bin\solr.cmd start
  2. Bring up solr admin http://localhost:8983/solr/#/
  3. Bring up banana http://localhost:8983/solr/banana/#/dashboard/solr/Word%20Dashboard?server=%2Fsolr%2F
  4. Set auto-refresh to 3s and past 5 min
  5. Clean up word_count_collection: .\bin\solr.cmd delete -c word_count_collection
  6. Recreate word_count_collection: .\bin\solr.cmd create -c word_count_collection -d word_count_configs
  7. Open up project in IntelliJ and debug WordCountTopology
  8. Demo!
  9. Stop solr .\bin\solr.cmd stop -all

Running the topology in local mode

Clone the project and open it in Eclipse. Make sure you're able to execute a maven build without errors.

  1. Open com.kitmenke.storm.WordCountTopology
  2. Right click on the class, Debug As -> Java Application

Running the topology on a cluster

  1. Build the project using mvn clean package
  2. Upload the jar to the cluster
  3. Submit the topology: storm jar storm-stlhug-demo-0.0.1-SNAPSHOT.jar com.kitmenke.storm.WordCountTopology WordCountTopology

Solr and Banana

Download solr from https://lucene.apache.org/solr/ and install https://lucene.apache.org/solr/guide/7_0/installing-solr.html#installing-solr

.\bin\solr.cmd start

Validate you can get to the Solr UI: http://localhost:8983/solr/

Copy word_count_configs to solr-7.0.1\server\solr\configsets example https://github.com/apache/lucene-solr/blob/releases/lucene-solr/6.0.0/solr/server/solr/configsets/basic_configs/conf/managed-schema

.\bin\solr.cmd create -c banana-int
.\bin\solr.cmd create -c word_count_collection -d word_count_configs

Install Banana from https://github.com/LucidWorks/banana/

Browse to Banana: http://localhost:8983/solr/banana/#/dashboard

Import Word Dashboard.json into Banana to create the dashboard.

Other useful commands / notes

Try creating an example document using the Solr admin UI:

"id": "zombie", 
"count": 24,
"updated": "2015-09-05T21:28:00Z"

Delete a collection and all data in it

.\bin\solr.cmd delete -c word_count_collection