edgent-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Dale LaBossiere (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (EDGENT-231) Add event-time time-based windows
Date Thu, 25 Aug 2016 16:56:20 GMT

    [ https://issues.apache.org/jira/browse/EDGENT-231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437210#comment-15437210

Dale LaBossiere commented on EDGENT-231:


> Add event-time time-based windows
> ---------------------------------
>                 Key: EDGENT-231
>                 URL: https://issues.apache.org/jira/browse/EDGENT-231
>             Project: Edgent
>          Issue Type: New Feature
>            Reporter: Dale LaBossiere
> TStream.last(period,unit,keyFn) creates an insertion-time time-based TWindow - a tuple's
timestamp, hence its lifetime in the time-based window, is based on the time it is inserted
into the window.
> On a couple of occasions some folks have asked about event-time time-based windows -
a tuple's timestamp (event-time) is present as a property in the tuple and that timestamp
is used for insertion and eviction processing.  Tuples need not be added to the window in
their event-time order though the partition contents are maintained in event-time order.
> The TStream API for such a time-based window could be:
> ```
>     <K> TWindow<T, K> last(long time, TimeUnit unit, Function<T, K>
keyFunction, ToLongFunction<T> timestampFn);
> ```
> See also: QUARKS-230

This message was sent by Atlassian JIRA

View raw message