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https://issues.apache.org/jira/browse/FLINK-5420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15882680#comment-15882680
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ASF GitHub Bot commented on FLINK-5420:
---------------------------------------
Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3412#discussion_r102940564
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/AbstractStreamOperator.java
---
@@ -887,6 +864,30 @@ public void close() {
// Watermark handling
//
------------------------------------------------------------------------
+ public <K> void
registerWatermarkCallback(KeyRegistry.OnWatermarkCallback<K> callback,
TypeSerializer<K> keySerializer) {
--- End diff --
Come to think of it, we should probably only expose a method like
`getInternalWatermarkCallbackService()`. (I discussed this offline with @kl0u)
> Make CEP operators rescalable
> -----------------------------
>
> Key: FLINK-5420
> URL: https://issues.apache.org/jira/browse/FLINK-5420
> Project: Flink
> Issue Type: Bug
> Components: CEP
> Affects Versions: 1.2.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
>
> This issue targets making the operators in the CEP library re-scalable. After
> this is implemented, the user will be able to take a savepoint and restart
> his job with a different parallelism.
> This issue depends on https://issues.apache.org/jira/browse/FLINK-5845.
> The way this is done is that we introduce the {{TimeServiceHandler}} in the
> {{AbstractStreamOperator}}, which keeps the registered
> {{InternalTimerService}} s (before this was in the
> {{AbstractStreamOperator}}) and a new service called {{KeyRegistry}}. The
> {{KeyRegistry}} will be fault tolerant and rescalable and will allow to
> register keys and a callback which will be invoked for each registered key
> upon reception of a watermark. This can be seen as keeping (recurring) timers
> for each of the registered keys that will fire "at the next watermark".
> After introducing this service, upon reception of a watermark, all the
> processing of the NFAs will be delegated to the callback.
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