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From "Manu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (GEARPUMP-342) Don't run DataSourceTask with WindowRunner unless necessary
Date Wed, 16 Aug 2017 23:20:00 GMT

     [ https://issues.apache.org/jira/browse/GEARPUMP-342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Manu Zhang reassigned GEARPUMP-342:
-----------------------------------

    Assignee: Manu Zhang

> Don't run DataSourceTask with WindowRunner unless necessary
> -----------------------------------------------------------
>
>                 Key: GEARPUMP-342
>                 URL: https://issues.apache.org/jira/browse/GEARPUMP-342
>             Project: Apache Gearpump
>          Issue Type: Improvement
>    Affects Versions: 0.8.4
>            Reporter: Manu Zhang
>            Assignee: Manu Zhang
>             Fix For: 0.8.5
>
>
> Currently, a windowed wordcount pipeline like {{source.flatMap.window.groupBy.count}}
will actually be executed as {{source.globalWindow.flatMap.groupBy.window.count}} and {{globalWindow.flatMap}}
run by a {{WindowRunner}}. 
> The {{globalWindow}} is unnecessary unless {{source}} is followed by an aggregation.
Further, the {{globalWindow}} requires {{Watermark.MAX}} to trigger emits which is not obvious
for users. 



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