December 2015
Beginner to intermediate
122 pages
2h 23m
English
Content preview from Building Python Real time Applications with StormBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating your first topology
Now, we'll create a Storm topology that breaks sentences into words and then counts the number of occurrences of each word. Implementing this topology in Storm requires the following components:
- Sentence spout (
randomsentence.py): A topology always begins with a spout; that's how data gets into Storm. The sentence spout will emit an infinite stream of sentences. - Splitter bolt (
splitsentence.py): This receives sentences and splits them into words. - Word count bolt (
wordcount.py): This receives words and counts the occurrences. For each word processed, output the word along with the number of occurrences.
The following figure shows how data flows through the topology:
Word count topology
Now that we've seen the basic data flow, ...
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