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| <p>Apache Storm has a simple and easy to use API. When programming on Apache Storm, you |
| manipulate and transform streams of tuples, and a tuple is a named list of values. Tuples |
| can contain objects of any type; if you want to use a type Apache Storm doesn't know |
| about it's <a href="../releases/current/Serialization.html">very easy</a> to register a |
| serializer for that type.</p> |
| |
| <p>There are just three abstractions in Apache Storm: spouts, bolts, and topologies. A <strong>spout</strong> |
| is a source of streams in a computation. Typically a spout reads from a queueing broker such |
| as Kestrel, RabbitMQ, or Kafka, but a spout can also generate its own stream or read from |
| somewhere like the Twitter streaming API. Spout implementations already exist for most |
| queueing systems.</p> |
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| <p>A <strong>bolt</strong> processes any number of input streams and produces any number of new |
| output streams. Most of the logic of a computation goes into bolts, such as functions, |
| filters, streaming joins, streaming aggregations, talking to databases, and so on.</p> |
| |
| <p>A <strong>topology</strong> is a network of spouts and bolts, with each edge in the network |
| representing a bolt subscribing to the output stream of some other spout or bolt. A topology |
| is an arbitrarily complex multi-stage stream computation. Topologies run indefinitely when |
| deployed.</p> |
| |
| <p>Apache Storm has a "local mode" where a Apache Storm cluster is simulated |
| in-process. This is useful for development and testing. The "storm" command line |
| client is used when ready to submit a topology for execution on an actual cluster.</p> |
| |
| <p>The <a href="https://github.com/apache/storm/tree/master/examples/storm-starter">storm-starter</a> |
| project contains example topologies for learning the basics of Apache Storm. Learn more |
| about how to use Apache Storm by reading the <a href="../releases/current/Tutorial.html">tutorial</a> |
| and the <a href="../releases/current/index.html">documentation</a>.</p> |
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| <span class="small">(Sunnyvale, CA)</span></li> |
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| <h5>About Apache Storm</h5> |
| <p>Apache Storm integrates with any queueing system and any database system. Apache Storm's spout |
| abstraction makes it easy to integrate a new queuing system. Likewise, integrating Apache Storm |
| with database systems is easy.</p> |
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