Github user koeninger commented on the pull request:
https://github.com/apache/spark/pull/3798#issuecomment-71120030
Yeah, it's pulled down every batch interval. That way you know exactly
what the upper and lower bounds of the offsets are.
On Thu, Jan 22, 2015 at 5:15 PM, Hari Shreedharan <[email protected]>
wrote:
> I like this! I didn't try building it, but the logic is great!
>
> So, to sum up the idea - the key detail here is that the checkpoint
> contains the metadata to regenerate the RDDs, thus original order and
> batches are recovered. That looks good - it was the same thing I was
trying
> to see if we could do in the Kafka receiver, but it would be difficult
> without some API changes.
>
> That brings me to a question - so in this PR, is the data pulled down from
> Kafka only once every batch interval - say every 2 seconds, or is there a
> way to generate it continuously rather than have spikes?
>
> â
> Reply to this email directly or view it on GitHub
> <https://github.com/apache/spark/pull/3798#issuecomment-71119114>.
>
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