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From Benchao Li <libenc...@gmail.com>
Subject Re: Sorting Bounded Streams
Date Sat, 30 May 2020 04:00:49 GMT
Hi Satyam,

Are you using blink planner in streaming mode? AFAIK, blink planner in
batch mode can sort on arbitrary columns.

Satyam Shekhar <satyamshekhar@gmail.com> 于2020年5月30日周六 上午6:19写道:

> Hello,
>
> I am using Flink as the streaming execution engine for building a
> low-latency alerting application. The use case also requires ad-hoc
> querying on batch data, which I also plan to serve using Flink to avoid the
> complexity of maintaining two separate engines.
>
> My current understanding is that Order By operator in Blink planner (on
> DataStream) requires time attribute as the primary sort column. This is
> quite limiting for ad-hoc querying. It seems I can use the DataSet API to
> obtain a globally sorted output on an arbitrary column but that will force
> me to use the older Flink planner.
>
> Specifically, I am looking for guidance from the community on the
> following questions -
>
>    1. Is it possible to obtain a globally sorted output on DataStreams on
>    an arbitrary sort column?
>    2. What are the tradeoffs in using DataSet vs DataStream in
>    performance, long term support, etc?
>    3. Is there any other way to address this issue?
>
> Regards,
> Satyam
>


-- 

Best,
Benchao Li

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