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Learning Storm by Anand Nalya, Ankit Jain

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The Storm data model

The basic unit of data that can be processed by a Storm application is called a tuple. Each tuple consists of a predefined list of fields. The value of each field can be a byte, char, integer, long, float, double, Boolean, or byte array. Storm also provides an API to define your own data types, which can be serialized as fields in a tuple.

A tuple is dynamically typed, that is, you just need to define the names of the fields in a tuple and not their data type. The choice of dynamic typing helps to simplify the API and makes it easy to use. Also, since a processing unit in Storm can process multiple types of tuples, it's not practical to declare field types.

Each of the fields in a tuple can be accessed by its name getValueByField(String) ...

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