[GitHub] pouledodue commented on a change in pull request #1502: Pulsar Functions diagrams (WIP)

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pouledodue commented on a change in pull request #1502: Pulsar Functions diagrams (WIP)
URL: https://github.com/apache/incubator-pulsar/pull/1502#discussion_r179565717
 
 

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 File path: site/docs/latest/functions/overview.md
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 @@ -41,7 +41,80 @@ The Pulsar Functions feature was inspired by (and takes cues from) several syste
 Pulsar Functions could be described as
 
 * [Lambda](https://aws.amazon.com/lambda/)-style functions that are
-* specifically designed to work with Pulsar
+* specifically designed to use Pulsar as a message bus
+
+## Programming model
+
+The core programming model behind Pulsar Functions is very simple:
+
+* Functions receive messages from one or more **input {% popover topics %}**. Every time a message is received, the function can do a variety of things:
+  * Apply some processing logic to the input and write output to:
+    * An **output topic** in Pulsar
+    * [Apache BookKeeper](#state-storage)
+  * Write logs to a **log topic**
 
 Review comment:
   @srkukarni can you elaborate

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