Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4041#discussion_r119595945
--- Diff: docs/dev/libs/cep.md ---
@@ -874,3 +1141,19 @@ val alerts = patternStream.select(createAlert(_)))
{% endhighlight %}
</div>
</div>
+
+## Migrating from an older Flink version
+
+The CEP library in Flink-1.3 ships with a number of new features which
have led to some changes in the API. Here we
+describe the changes that you need to make to your old CEP jobs, in order
to be able to run them with Flink-1.3. After
+making these changes and recompiling your job, you will be able to resume
its execution from a savepoint taken with the
+old version of your job, *i.e.* without having to re-process your past
data.
+
+The changes required are:
+
+1. Change your conditions (the ones in the `where(...)` clause) to extend
the `SimpleCondition` class instead of
+implementing the `FilterFunction` interface.
+
+2. Change your functions provided as arguments to the `select(...)` and
`flatSelect(...)` methods to expect a list of
+events associated with each state (`List` in `Java`, `Iterable` in
`Scala`). This is because with the addition of
+the looping states, multiple input events can much a single (looping)
state.
--- End diff --
much -> match
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