Hi Olga,
Not sure where it is stated in the docs to make sure that source/sink implements the interface.
From what I see in the source code, if a user function does not implement CheckpointedFunction or ListCheckpointed, its operator state will just not be snapshotted, but I do not see any problem for enabled checkpoint to snapshot what supports it and success for the job.
Best,
Andrey
> On 15 Nov 2018, at 18:20, Olga Luganska <
[hidden email]> wrote:
>
> Hello,
>
> By reading Flink documentation I see that to enable checkpointing we need to:
>
> 1. Enable checkpointing at the execution environment.
>
> 2. Make sure that your source/sink implements either CheckpointedFunction or ListCheckpointed interfaces?
>
> Is #2 a must, and how checkpointing mechanism is affected if your source does not implement mentioned above interfaces?
>
> (I see example of using RuntimeContext accessing keyed state)
>
> Please explain.
> Thank you very much,
> Olga
>
>
> Sent from my iPhone
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