[FLINK-6069] Add documentation CEP - Watermarks

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.2.0, 1.3.0
• Component/s: Library / CEP
• Assignee: Kostas Kloudas
• Reporter: Patrick Pircher
• Created: 16/Mar/17 08:34
• Updated: 31/Mar/17 11:18
• Resolved: 31/Mar/17 11:18

Description

I was trying to understand how CEP works with EventTime/Watermarks and specifically how it handles events that come out of order.
So the only thing I found was an email archive and some pointers in the Source Code.

http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/CEP-and-slightly-out-of-order-elements-td9439.html
https://github.com/apache/flink/blob/release-1.2.0/flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/operator/AbstractCEPPatternOperator.java#L71
https://github.com/apache/flink/blob/release-1.2.0/flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/operator/AbstractCEPPatternOperator.java#L96

Issue Links

• Is contained by: FLINK-6205 Put late elements in side output.