LND's Deadline-Aware Budget Sweeper

[t-bast]

@morehouse

Presumably this is why eclair switches to exponential bumping once the deadline gets close, and why LDK uses exponential bumping whenever the estimator does not return an increased fee rate.

That was indeed our reasoning for eclair!

@ismaelsadeeq

Then in this case instead of using the fee function for fee bumping immediately at n-1, you can give it a grace period of say up to int(n/2) + 1 before fee bumping using the output of the new budget based fee function. (More economical)

Towards the end when deadline is really close, you can combine both approaches take the maximum between the output of the fee function and ASAP fee rate estimate to increase the chances. (But when their is a fee spike towards the end of the deadline you might pay above budget using this method).

Those are good ideas, this is slightly different from what we do today, but in essence that’s what we’d like to achieve. We will update eclair to have a behavior that is closer to what you describe.