Ardagan commented on a change in pull request #11182: [BEAM-9650] Add
PeriodicImpulse Transform and slowly changing side input documentation
URL: https://github.com/apache/beam/pull/11182#discussion_r408337414
##########
File path: website/src/documentation/patterns/side-inputs.md
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@@ -45,4 +45,30 @@ For instance, the following code sample uses a `Map` to
create a `DoFn`. The `Ma
```java
{% github_sample
/apache/beam/blob/master/examples/java/src/main/java/org/apache/beam/examples/snippets/Snippets.java
tag:SideInputPatternSlowUpdateGlobalWindowSnip1
%}
-```
\ No newline at end of file
+```
+
+
+## Slowly updating side input using windowing
+
+You can read side input pcollection periodically into distinct windows.
+Later, when you apply side input to your main input, windows will be matched
automatically 1:1.
+This way, you can guarantee side input consistency on the duration of the
single window.
+
+To do this, you can utilize PeriodicSequence PTransform that will generate
infinite sequence
+of elements with some real-time period:
+
+1. Use the PeriodicImpulse transform to genearate windowed periodic sequence.
+
+ a. MAX_TIMESTAMP can be replaced with some closer boundary if you want to
stop generating elements at some point.
+
+1. Read data using Read operation triggered by arrival of PCollection element.
+
+1. Apply side input.
+
+```python
+{% github_sample
/apache/beam/blob/master/sdks/python/apache_beam/examples/snippets/snippets.py
tag:SideInputSlowUpdateSnip1
+%}
Review comment:
Addressed here: https://github.com/apache/beam/pull/11415
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