[
https://issues.apache.org/jira/browse/GEARPUMP-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15527971#comment-15527971
]
ASF GitHub Bot commented on GEARPUMP-23:
----------------------------------------
Github user manuzhang commented on the issue:
https://github.com/apache/incubator-gearpump/pull/85
@kkasravi
`stream.groupBy` is now a shortcut for
`stream.window(CountWindow.apply(1).triggering(CountTrigger).accumulating).groupBy`.
so `groupBy` has windowing semantics and all window operations should
follow `groupBy`
here is the window semantics
```
- Window
- WindowFn
-> SlidingWindowFn // FixedWindow and SlidingWindow
-> CountWindowFn // CountWindow
- Trigger
-> EventTimeTrigger // event time aggregation
-> ProcessingTimeTrigger // processing time aggregation
-> CountTrigger // count aggregation, used with CountWindowFn
- AccumulationMode
-> Accumulating // states are accumulated across windows
-> Discarding // states are not accumulated
```
> Add DSL window (time series) support
> -------------------------------------
>
> Key: GEARPUMP-23
> URL: https://issues.apache.org/jira/browse/GEARPUMP-23
> Project: Apache Gearpump
> Issue Type: Sub-task
> Components: streaming
> Affects Versions: 0.8.0
> Reporter: Kam Kasravi
> Assignee: Manu Zhang
>
> Time series support is need for both GEARPUMP-21 and GEARPUMP-22. This was
> originally github issue
> [1917|https://github.com/gearpump/gearpump/issues/1917]. Other realtime
> streaming engines support time windows such as
> [Flink|https://flink.apache.org/news/2015/12/04/Introducing-windows.html],
> [Beam|https://www.oreilly.com/ideas/the-world-beyond-batch-streaming-101] and
> a future release of
> [Spark|https://issues.apache.org/jira/secure/attachment/12793410/StructuredStreamingProgrammingAbstractionSemanticsandAPIs-ApacheJIRA.pdf].
> A comparison matrix is found
> [here|https://docs.google.com/spreadsheets/d/1OM077lZBARrtUi6g0X0O0PHaIbFKCD6v0djRefQRE1I/edit#gid=995660187]
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
