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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GEARPUMP-23) Add DSL window (time series) support
Date Tue, 07 Feb 2017 12:57:41 GMT

    [ https://issues.apache.org/jira/browse/GEARPUMP-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15855928#comment-15855928
] 

ASF GitHub Bot commented on GEARPUMP-23:
----------------------------------------

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

    https://github.com/apache/incubator-gearpump/pull/140#discussion_r99815386
  
    --- Diff: streaming/src/main/scala/org/apache/gearpump/streaming/dsl/window/api/WindowFunction.scala
---
    @@ -33,11 +33,19 @@ object WindowFunction {
     }
     
     trait WindowFunction[T] {
    +
       def apply(context: WindowFunction.Context[T]): Array[Window]
    +
    +  def isNonMerging: Boolean
    +}
    +
    +abstract class NonMergingWindowFunction[T] extends WindowFunction[T] {
    +
    +  override def isNonMerging: Boolean = true
    --- End diff --
    
    But if user's WindowFunction is not able to be merged, extending `NonMergingWindowFunction`
would suffice, otherwise extending `WindowFunction`


> 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]



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