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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1967) Introduce (Event)time in Streaming
Date Wed, 01 Jul 2015 15:14:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14610436#comment-14610436
] 

ASF GitHub Bot commented on FLINK-1967:
---------------------------------------

Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/879#discussion_r33688371
  
    --- Diff: flink-core/src/main/java/org/apache/flink/api/common/ExecutionConfig.java ---
    @@ -141,6 +144,25 @@ public boolean isClosureCleanerEnabled() {
     	}
     
     	/**
    +	 * Sets the interval of the automatic watermark emission. Watermaks are used throughout
    +	 * the streaming system to keep track of the progress of time. They are used, for example,
    +	 * for time based windowing.
    +	 */
    +	public ExecutionConfig setAutoWatermarkInterval(Duration interval) {
    --- End diff --
    
    I think it doesn't make sense right now to add documentation for this without a document
that describes the broad concepts in Streaming. This touches on a lot of stuff such as event-time
vs processing-time, windowing semantics and so on. I think @StephanEwen started the discussion
on such a document somewhere.


> Introduce (Event)time in Streaming
> ----------------------------------
>
>                 Key: FLINK-1967
>                 URL: https://issues.apache.org/jira/browse/FLINK-1967
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> This requires introducing a timestamp in streaming record and a change in the sources
to add timestamps to records. This will also introduce punctuations (or low watermarks) to
allow windows to work correctly on unordered, timestamped input data. In the process of this,
the windowing subsystem also needs to be adapted to use the punctuations. Furthermore, all
operators need to be made aware of punctuations and correctly forward them. Then, a new operator
must be introduced to to allow modification of timestamps.



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