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From Guozhang Wang <wangg...@gmail.com>
Subject Re: Batch processing with Kafka Streams with at-least-once semantics
Date Tue, 16 Oct 2018 15:18:44 GMT
I think we should not allow negative values, and today it seems that this
is not checked against.

In fact, it should be a one-liner fix in the `config.define` function call
to constraint its possible value range. Would you like to contribute a PR?


Guozhang


On Fri, Oct 12, 2018 at 10:56 PM Tomoyuki Saito <aocchoda@gmail.com> wrote:

> Hello Guozhang,
>
> Thank you for your reply.
>
> > setting to "0" will actually mean to commit every time.
>
> Hum, I somehow misunderstood the code. Now I understand that is true.
>
> > You should actually set it to Long.MAX_VALUE to indicate "not commit
> regularly by intervals"
>
> I see. I'd consider taking that approach!
>
>
> Another question just from curiosity:
>
> From looking at code, setting `commit.interval.ms` to a negative value can
> also indicate "not commit regularly by intervals." In other words, it has
> the same effect as setting it to Long.MAX_VALUE.
> Is this true?
>
> The implication of setting the property to a negative value is
> undocumented, so I'm thinking setting it to Long.MAX_VALUE is preferable.
>
> Thank you.
> Tomoyuki
>
> On Sat, Oct 13, 2018 at 1:48 AM Guozhang Wang <wangguoz@gmail.com> wrote:
>
> > Hello Tomoyuki,
> >
> > 1. Seems a good use case for Streams.
> > 2. You should actually set it to Long.MAX_VALUE to indicate "not commit
> > regularly by intervals", setting to "0" will actually mean to commit
> every
> > time. Then you can leverage on ProcessorContext.commit() to manually
> commit
> > after the batch is done.
> >
> >
> > Guozhang
> >
> >
> >
> >
> > On Wed, Oct 10, 2018 at 11:15 PM, Tomoyuki Saito <aocchoda@gmail.com>
> > wrote:
> >
> > > Hi,
> > >
> > > I'm exploring whether it is possible to use Kafka Streams for batch
> > > processing with at-least-once semantics.
> > >
> > > What I want to do is to insert records in an external storage in bulk,
> > and
> > > execute offset-commit after the bulk insertion to achieve at-least-once
> > > semantics.
> > > A processing topology can be very simple like:
> > > ```
> > > TopologyBuilder builder = new TopologyBuilder();
> > > builder.addSource("source", "topic");
> > > builder.addProcessor("processor", processorSupplier, "source");
> > > new KafkaStreams(builder, streamsConfig);
> > > ```
> > >
> > > My questions are:
> > >
> > > 1. Could you suggest how to achieve that? Can it be better to use
> > > KafkaConsumer instead of KafkaStreams?
> > >
> > > 2. From my understanding, when setting StreamsConfig `
> commit.interval.ms
> > `
> > > to 0, we can turn off offset-commit by KafkaStreams internal logic (in
> > > StreamThread#maybeCommit), and control when to commit offsets with
> > > `ProcessorContext#commit`. Is my understanding right? Any expected
> issues
> > > for this approach?
> > >
> > > Thank you,
> > > Tomoyuki
> > >
> >
> >
> >
> > --
> > -- Guozhang
> >
>


-- 
-- Guozhang

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