Manu Zhang created GEARPUMP-342:
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Summary: 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
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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