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From Till Rohrmann <till.rohrm...@gmail.com>
Subject Re: Question about flink message processing guarantee
Date Wed, 02 Dec 2015 08:19:36 GMT
Just a small addition. Your sources have to be replayable to some extent.
With replayable I mean that they can continue from some kind of offset.
Otherwise the check pointing won't help you. The Kafka source supports that
for example.

Cheers,
Till
On Dec 1, 2015 11:55 PM, "Márton Balassi" <balassi.marton@gmail.com> wrote:

> Dear Jerry,
>
> If you do not enable checkpointing you get the at most once processing
> guarantee (some might call that no guarantee at all). When you enable
> checkpointing you can choose between exactly and at least once semantics.
> The latter provides better latency.
>
> Best,
>
> Marton
>
> On Tue, Dec 1, 2015 at 11:04 PM, Jerry Peng <jerry.boyang.peng@gmail.com>
> wrote:
>
>> Hello,
>>
>> I have a question regarding link streaming.  I now if you enable
>> checkpointing you can have exactly once processing guarantee. If I do
>> not enable checkpointing what are the semantics of the processing? At
>> least once?
>>
>> Best,
>>
>> Jerry
>>
>
>

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