| # Example Storm Topologies |
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| Learn to use Storm! |
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| --- |
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| Table of Contents |
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| * <a href="#getting-started">Getting started</a> |
| * <a href="#maven">Using storm-starter with Maven</a> |
| * <a href="#intellij-idea">Using storm-starter with IntelliJ IDEA</a> |
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| --- |
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| <a name="getting-started"></a> |
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| # Getting started |
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| ## Prerequisites |
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| First, you need `java` and `git` installed and in your user's `PATH`. Also, two of the examples in storm-starter |
| require Python and Ruby. |
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| Next, make sure you have the storm-starter code available on your machine. If you have already downloaded storm from http://storm.apache.org/downloads.html then you will find the storm-starter code under your `apache-storm-<version>/examples/` directory. Alternatively, Git/GitHub beginners may want to use the |
| following command to download the latest storm-starter code and change to the new directory that contains the downloaded |
| code, but make sure you have the same version of `storm` running. |
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| $ git clone git://github.com/apache/storm.git && cd storm/examples/storm-starter |
| |
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| ## storm-starter overview |
| |
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| storm-starter contains a variety of examples of using Storm. If this is your first time working with Storm, check out |
| these topologies first: |
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| 1. [ExclamationTopology](src/jvm/org/apache/storm/starter/ExclamationTopology.java): Basic topology written in all Java |
| 2. [WordCountTopology](src/jvm/org/apache/storm/starter/WordCountTopology.java): Basic topology that makes use of multilang by |
| implementing one bolt in Python |
| 3. [ReachTopology](src/jvm/org/apache/storm/starter/ReachTopology.java): Example of complex DRPC on top of Storm |
| 4. [LambdaTopology](src/jvm/org/apache/storm/starter/LambdaTopology.java): Example of writing spout/bolt using Java8 lambda expression |
| |
| After you have familiarized yourself with these topologies, take a look at the other topopologies in |
| [src/jvm/org/apache/storm/starter/](src/jvm/org/apache/storm/starter/) such as [RollingTopWords](src/jvm/org/apache/storm/starter/RollingTopWords.java) |
| for more advanced implementations. |
| |
| If you want to learn more about how Storm works, please head over to the |
| [Storm project page](http://storm.apache.org). |
| |
| |
| <a name="maven"></a> |
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| # Using storm-starter with Maven |
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| ## Install Maven |
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| Install [Maven](http://maven.apache.org/) (preferably version 3.x) by following |
| the [Maven installation instructions](http://maven.apache.org/download.cgi). |
| |
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| ## Build and install Storm jars locally |
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| If you are using the latest development version of Storm, e.g. by having cloned the Storm git repository, |
| then you must first perform a local build of Storm itself. Otherwise you will run into Maven errors such as |
| "Could not resolve dependencies for project `org.apache.storm:storm-starter:<storm-version>-SNAPSHOT`". |
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| # Must be run from the top-level directory of the Storm code repository |
| $ mvn clean install -DskipTests=true |
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| This command will build Storm locally and install its jar files to your user's `$HOME/.m2/repository/`. When you run |
| the Maven command to build and run storm-starter (see below), Maven will then be able to find the corresponding version |
| of Storm in this local Maven repository at `$HOME/.m2/repository`. |
| |
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| ## Packaging storm-starter for use on a Storm cluster |
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| You can package a jar suitable for submitting to a Storm cluster with the command: |
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| $ mvn package |
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| This will package your code and all the non-Storm dependencies into a single "uberjar" (or "fat jar") at the path |
| `target/storm-starter-{version}.jar`. |
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| Example filename of the uberjar: |
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| >>> target/storm-starter-0.9.3-incubating-SNAPSHOT.jar |
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| You can submit (run) a topology contained in this uberjar to Storm via the `storm` CLI tool: |
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| # Example 1: Run the ExclamationTopology in local mode (LocalCluster) |
| $ storm jar target/storm-starter-*.jar org.apache.storm.starter.ExclamationTopology -local |
| |
| # Example 2: Run the RollingTopWords in remote/cluster mode, |
| # under the name "production-topology" |
| $ storm jar target/storm-starter-*.jar org.apache.storm.starter.RollingTopWords production-topology |
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| With submitting you can run topologies which use multilang, for example, `WordCountTopology`. |
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| ### Submitting a topology in local vs. remote mode. |
| You can also submit any topology in local mode via the `storm local` command, which works much like the `storm jar` command described above. If you need to run the examples from your IDE, you will need to modify the project slightly, to add a dependency on the `storm-server` module, and use `LocalCluster` to create a local cluster you can submit your topology to. Please see the documentation describing [Local Mode](https://github.com/apache/storm/blob/master/docs/Local-mode.md) for a complete overview of this topic. |
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| ## Running unit tests |
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| Use the following Maven command to run the unit tests that ship with storm-starter. Unfortunately `lein test` does not |
| yet run the included unit tests. |
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| $ mvn test |
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| <a name="intellij-idea"></a> |
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| # Using storm-starter with IntelliJ IDEA |
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| ## Importing storm-starter as a project in IDEA |
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| The following instructions will import storm-starter as a new project in IntelliJ IDEA. |
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| * Open _File > Import Project..._ and navigate to the storm-starter directory of your storm clone (e.g. |
| `~/git/storm/examples/storm-starter`). |
| * Select _Import project from external model_, select "Maven", and click _Next_. |
| * In the following screen, enable the checkbox _Import Maven projects automatically_. Leave all other values at their |
| defaults. Click _Next_. |
| * Make sure to select the *intellij* profile in the profiles screen. This is important for making sure dependencies set correctly. |
| * Click _Next_ on the following screen about selecting Maven projects to import. |
| * Select the JDK to be used by IDEA for storm-starter, then click _Next_. |
| * At the time of this writing you should use JDK 7 and above. |
| * It is strongly recommended to use Oracle JDK rather than OpenJDK. |
| * You may now optionally change the name of the project in IDEA. The default name suggested by IDEA is "storm-starter". |
| Click _Finish_ once you are done. |