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https://issues.apache.org/jira/browse/GEARPUMP-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234206#comment-15234206
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Kam Kasravi commented on GEARPUMP-23:
-------------------------------------
Comments from [~mauzhang] moved from
https://github.com/gearpump/gearpump/issues/1034
We only have `WindowState` now, which limits the usage of windowing to
exactly-once processing. A full windowing support should be oblivious to
whether it's at-most-once, at-least-once or exactly-once. Also, we need a
window function in DSL API.
Besides, [Google's Dataflow
model](http://static.googleusercontent.com/media/research.google.com/en//pubs/archive/43864.pdf)
introduced the concept of event-time processing, unaligned window / session
(while only aligned window is supported now)
> Sessions are windows that capture some period of activity
over a subset of the data, in this case per key. Typically
they are defined by a timeout gap. Any events that occur
within a span of time less than the timeout are grouped
together as a session. Sessions are unaligned windows.
and triggers over window for incremental processing as well as use cases that
motivates such concepts
use cases | requirements
-------------- | -------------------
session-based analysis for search, ads, analytics, social, and YouTube |
unaligned windows
billing pipelines | triggers and incremental processing support via
accumulation and retraction
aggregate statistics calculations | watermark triggers
abuse detection pipelines | percentile watermark triggers
recommendation generation | processing (system) time triggers
anomaly detection | data driven triggers
It's nice for Gearpump to have these augments, and it shouldn't be hard for
Gearpump to do so since event-time processing and watermark are already
built-in.
In summary, I'd like to implement the following features for windowing support,
- [ ] window processor in Graph API for all message processing semantics
- [ ] window function in DSL API for all message processing semantics
- [ ] support unaligned sessions
- [ ] trigger API that includes event-time triggers, watermark triggers and
data driven triggers (not sure whether we need processing time triggers)
> Add DSL window (time series) support
> -------------------------------------
>
> Key: GEARPUMP-23
> URL: https://issues.apache.org/jira/browse/GEARPUMP-23
> Project: Apache Gearpump
> Issue Type: New Feature
> Components: streaming
> Affects Versions: 0.8.0
> Reporter: Kam Kasravi
> Fix For: 0.8.1
>
>
> 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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