Re: Question about flink message processing guarantee
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"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 > 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 >> > >
Re: Question about flink message processing guarantee
There is an overview of what guarantees what sources can give you: https://ci.apache.org/projects/flink/flink-docs-master/apis/fault_tolerance.html#fault-tolerance-guarantees-of-data-sources-and-sinks On Wed, Dec 2, 2015 at 9:19 AM, Till Rohrmannwrote: > 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" > 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 >> 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 >>> >> >>
Question about flink message processing guarantee
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
Re: Question about flink message processing guarantee
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 Pengwrote: > 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 >