Re: Kafka partition alignment for event time

Posted by Aljoscha Krettek on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Kafka-partition-alignment-for-event-time-tp4782p4794.html

Hi,
in general it should not be a problem if one parallel instance of a sink is responsible for several Kafka partitions. It can become a problem if the timestamps in the different partitions differ by a lot and the watermark assignment logic is not able to handle this.

How are you assigning the timestamps/watermarks in your job?

Cheers,
Aljoscha

> On 08 Feb 2016, at 21:51, shikhar <[hidden email]> wrote:
>
> Stephan explained in that thread that we're picking the min watermark when
> doing operations that join streams from multiple sources. If we have m:n
> partition-source assignment where m>n, the source is going to end up with
> the max watermark. Having m<=n ensures that the lowest watermark is used.
>
> Re: automatic enforcement, perhaps allowing for more than 1 Kafka partition
> on a source should require opt-in, e.g. allowOversubscription()
>
>
>
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