laanwj 00ce8543f1 Merge bitcoin/bitcoin#24171: p2p: Sync chain more readily from inbound peers during IBD ...

48262a00f5 Add functional test for block sync from inbound peers (Suhas Daftuar)
0569b5c4bb Sync chain more readily from inbound peers during IBD (Suhas Daftuar)

Pull request description:

  When in IBD, if the honest chain is only known by inbound peers, then we must
  eventually sync from them in order to learn it. This change allows us to
  perform initial headers sync and fetch blocks from inbound peers, if we have no
  blocks in flight.

  The restriction on having no blocks in flight means that we will naturally
  throttle our block downloads to any such inbound peers that we may be
  downloading from, until we leave IBD. This is a tradeoff between preferring
  outbound peers for most of our block download, versus making sure we always
  eventually will get blocks we need that are only known by inbound peers even
  during IBD, as otherwise we may be stuck in IBD indefinitely (which could have
  cascading failure on the network, if a large fraction of the network managed to
  get stuck in IBD).

  Note that the test in the second commit fails on master, without the first commit.

ACKs for top commit:
  ajtowns:
    ACK 48262a00f5
  sipa:
    ACK 48262a00f5

Tree-SHA512: ffad3a05fa9a32a92226843c9128f52c275e8d51930fde7368badc340227f2ed680561c4c9f2937b4e3bd722474464849ec9b624f912f5e380ce98d71b55764d

2022-06-02 22:35:05 +02:00

32 KiB

Executable File

Raw Blame History

View Raw