[jira] [Commented] (FLINK-3536) Make clearer distinction between event time and processing time

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15171876#comment-15171876 ] 

Ufuk Celebi commented on FLINK-3536:
------------------------------------

+1

> Make clearer distinction between event time and processing time
> ---------------------------------------------------------------
>
>                 Key: FLINK-3536
>                 URL: https://issues.apache.org/jira/browse/FLINK-3536
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>            Reporter: Till Rohrmann
>            Priority: Minor
>
> If you define your own windows it is easy to mix up the time characteristic with the wrong set of predefined {{WindowAssigners}}. You cannot use processing time with a {{TumblingTimeWindows}} window assigner, for example.
> Neither from the name of {{TumblingTimeWindows}} nor from the JavaDocs it is clearly obvious that this {{WindowAssigner}} can only be used with event time. I think it would be better to rename the event time window assigner to something like {{TumblingEventTimeWindows}}. Additionally, we could extend the JavaDocs a bit, since not everyone knows that "based on the timestamps" means based on event time.



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