August 2017
Beginner to intermediate
284 pages
6h 51m
English
Content preview from Mastering Apache Storm
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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 datatypes, 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 datatype. 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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