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https://issues.apache.org/jira/browse/FLINK-2666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14942603#comment-14942603
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ASF GitHub Bot commented on FLINK-2666:
---------------------------------------

Github user gyfora commented on the pull request:

    https://github.com/apache/flink/pull/1201#issuecomment-145329072
  
    Go ahead :)


> Allow custom Timestamp extractors for Flink sources
> ---------------------------------------------------
>
>                 Key: FLINK-2666
>                 URL: https://issues.apache.org/jira/browse/FLINK-2666
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Gyula Fora
>            Assignee: Aljoscha Krettek
>            Priority: Minor
>
> When record timestamps are turned on users currently have 2 ways of 
> specifying record timestamps.
> They can either chose to automatically attach ingress timestamps (and send 
> watermarks), or custom implement a sourcefunction to manually assign 
> timestamps and emit watermarks.
> It would be good if users could define a Timestamp extractor function that 
> will attach a timestamp for every record generated using any of the current 
> Flink sources. Also watermarks for these records should be automatically 
> generated based on the extracted event time (assuming monotonicity per 
> source) periodically.



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