Beacon sync reorg headers download processing #3359
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why With slow peer management, the last remaining sync peer is never zombified if it is *slow* but delivers some data. This was implemented for the blocks download only, now extended to headers download.
why Headers download and stashing on header chain cache is now updated after how it is done for blocks (which was originally re-modelled somehow after the headers download in PR #3306.) Apart from a code cleanup, the main change is that each queued record will now hold only a single sync peer response (previously this was a list of several concatenated responses.)
why
This restriction is a legacy construct which was used for
+ allowing to run on a single peer for testing
+ implicitly restrict the header and block queues when the size
was restricted by a high-water-mark rather than a strict upper
bound.
why This reduces some some need for in-memory cache space. When downloading 22.6m headers from `mainnet` with download request size 1024 one can make it in just under a hour on a well exposed site (so that enough peers are available.) Reducing the request size to 800 one gets just some minutes over an hour.
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