peer: Add per-peer stall detection (WIP) - #32
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Converting to draft because this depends on 65bf637 |
rustaceanrob
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March 5, 2026 14:24
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Syncing from one peer is only as fast as that peer. Connect to several at once and share the work of downloading blocks between them, so a slow or unresponsive peer no longer holds up the whole sync. A shared queue and an in-flight set coordinate the peers: each block is fetched by exactly one peer, and any block left behind when a peer drops returns to the queue for another to fetch, so none is stranded. Peers fetch blocks out of order, but the kernel must connect them in chain order. A shared buffer holds each arriving block until its parent has been handed off, then releases the unbroken run that now extends the tip. Without it the sync stalls the moment one peer holds a block whose parent another peer has not yet delivered.
A peer connection can stay alive while never delivering the blocks it was requested, leaving the sync partially stuck behind a peer that is effectively idle. Detect a peer that has gone too long without making progress and drop it, letting the pool replace it with another one.
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Depends on #31.
Detects a peer that keeps its connection open but stops delivering the blocks it was asked for, and drops it so the work can go to another peer. Full description and rationale once the approach settles. Not ready for review.