I put together 
https://docs.google.com/document/d/1Dx18qBTvFWNqwLeecemOpKfleKzFyeV3Qwh71SHATvY/edit?usp=sharing
which explains a bit how I think about progress and might be helpful.

On Mon, Aug 21, 2017 at 10:22 AM, Vikas RK <[email protected]> wrote:
> Hi,
>
>   I have updated the proposal
> <https://s.apache.org/beam-fn-api-progress-reporting> based on the comments
> received. The major change is that the SDK no longer reports cumulative
> backlog, but includes more details for each transform itself. This provides
> a Runner more information about each transform in the fused sub-graph,
> while still being able to compute bundle progress and backlog. Thanks to
> Robert, Eugene and Luke for some key insights.
>
> Prototyping is in progress, will share with you all when I have something
> concrete.
>
> Regards,
> Vikas
>
> On 17 July 2017 at 13:24, Kenneth Knowles <[email protected]> wrote:
>
>> This seems really well thought-out. A useful read for anyone interested in
>> Splittable DoFn, too.
>>
>> On Thu, Jul 13, 2017 at 11:34 AM, Vikas RK <[email protected]> wrote:
>>
>> > Hi,
>> >
>> > I wanted to share a drafted proposal for Progress Reporting in Fn API.
>> >
>> >  https://s.apache.org/beam-fn-api-progress-reporting
>> > <https://www.google.com/url?q=https%3A%2F%2Fs.apache.org%
>> > 2Fbeam-fn-api-progress-reporting&sa=D&sntz=1&usg=AFQjCNHXxzlsB-
>> > 9oogQIr6Hril9c67SdEw>
>> > .
>> >
>> > Would like to get comments and feedback from the community.
>> >
>> > Regards,
>> > Vikas
>> >
>>

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