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Chris LuandDevin
673d1a02e0
* operation: euthanize pooled upload conns that stall far below a fast host A pooled keep-alive conn can wedge and drain the request body at a trickle while fresh conns to the same volume run at full rate; every later upload routed onto it stalls for tens of seconds, indefinitely. Track per-host healthy-rate uploads (>=1MiB/s on a >=256KiB body) and, on a host that was fast within the last minute, cancel an upload still in flight past max(10s, size/256KiB/s): the transport discards the wedged conn and the existing retry dials a fresh one. A watchdog kill also clears the fast mark so the retried attempt runs unbounded, and hosts that never prove fast keep today's unbounded behavior - a chronically slow link is never penalized. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * operation: keep the stall watchdog armed through the response read uploadDone was set as soon as Do() returned, so a conn that accepted the request body then wedged on the reply escaped the watchdog and could park the upload for hours — the same failure this watchdog exists to kill. Deferring the done-store keeps the timer live until the function returns, so a stalled io.ReadAll is cancelled and retried like a stalled write. The redundant post_err recheck goes with it. * operation: pin watchdog coverage of a stalled response read * operation: disarm the stall watchdog for an upload's remaining attempts Once the watchdog has cancelled an attempt, a concurrent healthy upload to the same host can restore the fast mark during the retry backoff. The re-armed watchdog would then cancel the retry too, and a large upload that merely exceeds the floor could burn every attempt. Track the watchdog kill on uploadStatusError and carry a stallWatchdogDisarmed flag through retriedUploadData so the rest of that upload's attempts run unbounded; other uploads to the host keep their watchdog. * operation: pin watchdog disarm on retry, fresh-dial, and slow-upload cases * operation: drop the send-stall watchdog once the request body drains A wedged pooled conn is only blameworthy while it is still trickling the request body; once the body is on the wire the wait is server-side commit, which the transport's response header timeout already bounds. Cancelling then would fail a healthy write whose replication or fsync is simply slow. Track body EOF through a wrapping reader, gate the send-side timer on it, and re-arm the watchdog only around the response-body read, which the header timeout does not cover. * operation: prove a host fast only on a verified upload A quick rejection moves bytes no faster than the wire did, so mark the host from the body-send duration and only after the response checks out. * operation: count an abandoned request body as sent The transport closes a request body it never finished draining when the server answers early, so EOF alone under-reports the send boundary and the stall watchdog could still blame the conn during the reply wait. * operation: scope the body-sent mark to the current attempt A lagging Close or EOF from the first attempt's body could stamp the shared mark after the inner retry reset it, disarming the watchdog for a send that never happened; each attempt now points the watchdog at its own sent timestamp. * operation: drop only the fast mark the stall timer observed A concurrent upload can re-prove the host while a stalled attempt is in flight; deleting the key outright would erase that newer mark, so the watchdog now removes only the value it armed against. * operation: keep the stall disarm on a per-call upload option retriedUploadData marked the caller's UploadOption, so a caller reusing it across UploadData calls would start the next upload with the watchdog off and lose the cancellation this adds. * test: stall watchdog retry must fail if the conn gets cancelled The fake retry slept through any cancellation, so a re-armed watchdog firing mid-retry still let the upload succeed — the guard was untested. Park on the request context like a real wedged conn so a re-armed watchdog cancels the attempt and fails the test. * operation: prove the fast-host mark with elapsed-to-response Body-drain time only measures when the transport consumed the reader: kernel socket buffers can swallow a small body instantly on a slow link, inflating the rate and marking the host fast. The next upload then gets its conn cancelled mid-send despite making progress. Elapsed-to-response bounds remote speed from below — the server cannot answer before the body lands — so the mark can only under-mark, never over-mark. * operation: scale the stall budget off the host's measured rate Fixed bps limits fit no link well: 256KiB/s never fires on a slow link and waits far too long on a fast one. Record the wire rate of each sizeable upload and let a later upload run for slowFactor times the body's span at that rate — a wedged conn shows as an order-of-magnitude drop on any link speed. The recorded rate uses the wire body size so a pre-compressed payload no longer inflates the mark. --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>