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Busy is not dead: the supervisor stops killing a working server #495

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Merged
gHashTag merged 1 commit into from
Sep 21, 2026
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Busy is not dead: the supervisor stops killing a working server #495

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15 changes: 13 additions & 2 deletions trios/agent-server/docker-entrypoint.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -41,18 +41,29 @@ set -e
# declares it; curl is not installed here.
#
# One healthy answer resets the count: a slow minute is not a dead server.
#
# BUSY IS NOT DEAD. The first version allowed four misses of a ten-second probe,
# and measured 2026-09-21 it killed the server itself - twice, at fourteen lanes
# and at twenty, each time about two minutes after the lanes filled. With every
# lane working, the event loop is saturated and /health takes longer than ten
# seconds; the server was alive and making progress, and ending it destroyed
# every bee's turn in flight. So a probe now waits LIVENESS_TIMEOUT (30 s) and
# twelve misses in a row are needed: roughly twelve minutes of silence. A hang
# of the kind this exists for - nine hours of `Application failed to respond`
# - is caught all the same; a busy stretch is not.
run_supervised() {
"$@" &
server=$!
trap 'kill -TERM "$server" 2>/dev/null' TERM INT
(
port="${PORT:-8080}"
interval="${LIVENESS_INTERVAL:-30}"
fails_allowed="${LIVENESS_FAILS:-4}"
fails_allowed="${LIVENESS_FAILS:-12}"
probe_timeout="${LIVENESS_TIMEOUT:-30}"
sleep "${LIVENESS_GRACE:-240}"
fails=0
while kill -0 "$server" 2>/dev/null; do
if python3 -c "import urllib.request; urllib.request.urlopen('http://127.0.0.1:$port/health', timeout=10)" >/dev/null 2>&1; then
if python3 -c "import urllib.request; urllib.request.urlopen('http://127.0.0.1:$port/health', timeout=$probe_timeout)" >/dev/null 2>&1; then
fails=0
else
fails=$((fails + 1))
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