Github user kl0u commented on a diff in the pull request: https://github.com/apache/flink/pull/4041#discussion_r119596846 --- 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 -- hehe good "cats" (catch) :P
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