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Sentiment Clickstream Machine/Sensor Server Logs Geo-location Monitor real- time data to… Prevent Optimize Securities Fraud Compliance violations Security breaches Network Outages ---Machine failuresDriver & fleet issues Application failures Operational issues Order routing Pricing Bandwidth allocation Customer service Offers Pricing Supply chain Routes Pricing Site content FinanceTelcoRetailManufactur- ing TransportationWeb Common Scenarios

Tuples  Core Unit of Data  Immutable Set of Key/Value Pair Bolts  Core functions of a streaming computation  Receive tuples and do stuff  Optionally emit additional tuples Spouts  Source of Streams  Wraps a streaming data source and emits Tuples Core Components of Apache Storm Topology  Arrangement of Spouts and Bolts  Unit of deployment & management

TridentTopology topology = new TridentTopology(); FixedBatchSpout spout = new FixedBatchSpout(…); Stream stream = topology.newStream(“words”, spout); stream.each(…, new Myfunction()).groupBy().each(…, new MyFilter()).persistentAggregate(…); Trident Fluent, Stream-Oriented API