[25.x] Parallel compact block downloads #27752

1. 
   fanquake commented at 1:25 pm on May 25, 2023: member

   Backports:

   • #27626
   • https://github.com/bitcoin/bitcoin/pull/27743
2. fanquake added this to the milestone 25.1 on May 25, 2023
3. 
   DrahtBot commented at 1:25 pm on May 25, 2023: contributor

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   Type	Reviewers
   ACK	instagibbs, ajtowns
   Stale ACK	Sjors

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4. DrahtBot added the label Backport on May 25, 2023
5. 
   Sjors commented at 1:26 pm on May 27, 2023: member

   utACK 50c86f57af5c6a9aa2e4828aeb67d641340b0860

   I got a bit confused because this PR builds on slightly older 25.x commit.

6. fanquake force-pushed on Jun 2, 2023
7. DrahtBot added the label CI failed on Jun 2, 2023
8. alias BlockDownloadMap for mapBlocksInFlight

   Github-Pull: #27626
   Rebased-From: 86cff8bf18f2c6344a25ad8b81cf366201a73c36

   722361e129
9. Remove nBlocksInFlight

   Github-Pull: #27626
   Rebased-From: a90595478dcf4e443cd15bbb822d485dc42bdb18

   a45159b8e2
10. Convert mapBlocksInFlight to a multimap

    Github-Pull: #27626
    Rebased-From: cce96182ba2457335868c65dc16b081c3dee32ee

    38e3af9fad
11. Only request full blocks from the peer we thought had the block in-flight

    This is a change in behavior so that if for some reason we request a block from a peer, we don't allow an unsolicited CMPCT_BLOCK announcement for that same block to cause a request for a full block from the uninvited peer (as some type of request is already outstanding from the original peer)
    
    Github-Pull: #27626
    Rebased-From: 13f9b20b4cb2f3f26e81184a77e9cf1f626d4f57

    d1a93f5d41
12. Support up to 3 parallel compact block txn fetchings

    A single outbound slot is required, so if the first two slots
    are taken by inbound in-flights, the node will reject additional
    unless they are coming from outbound.
    
    This means in the case where a fast sybil peer is attempting to
    stall out a node, a single high bandwidth outbound peer can
    mitigate the attack.
    
    Github-Pull: #27626
    Rebased-From: 03423f8bd12b95a06a4a9d8377e781625dd38aae

    e66a5cbb56
13. Add tests for parallel compact block downloads

    Github-Pull: #27626
    Rebased-From: d7f359b35e8b1e9acc4d397de262cd9ba9bbcb83

    cdd3de08e3
14. Unconditionally return when compact block status == READ_STATUS_FAILED

    Github-Pull: #27743
    Rebased-From: d97269579769effbe6eec2303ea0cc3e396d3e0d

    b8ad3220a9
15. fanquake force-pushed on Jun 16, 2023
16. DrahtBot removed the label CI failed on Jun 16, 2023
17. fanquake marked this as ready for review on Jun 30, 2023
18. fanquake requested review from instagibbs on Jun 30, 2023
19. fanquake requested review from ajtowns on Jul 2, 2023
20. 
    instagibbs commented at 5:26 pm on July 3, 2023: member

    utACK https://github.com/bitcoin/bitcoin/pull/27752/commits/b8ad3220a9068f10c2b3b14b40f211372aeece31
21. DrahtBot removed review request from instagibbs on Jul 3, 2023
22. DrahtBot requested review from Sjors on Jul 3, 2023
23. 
    ajtowns commented at 10:16 am on July 4, 2023: contributor

    ACK b8ad3220a9068f10c2b3b14b40f211372aeece31 ; confirmed patches are clean cherry-picks from master, and already tested patches prior to 25.0 release
24. DrahtBot removed review request from ajtowns on Jul 4, 2023
25. fanquake merged this on Jul 4, 2023
26. fanquake closed this on Jul 4, 2023

    ---

27. fanquake deleted the branch on Jul 4, 2023
28. bitcoin locked this on Jul 3, 2024

Contributors
fanquake DrahtBot Sjors instagibbs ajtowns

Review Requested
Sjors

Labels
Backport

Milestone
25.1