docs: graceful shutdown waits for every HTTP/2 stream, async routes and std h2c included (celeris#759) - #82
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WalkthroughThe guides describe HTTP/1.1 and HTTP/2 drain coverage since Celeris v1.6.0. They update shutdown behaviour, measured outcomes, and pre-v1.6.0 notes in ChangesGraceful shutdown documentation
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…nd std h2c included (celeris#759)
…eams opened after the GOAWAY, and waits for data held by flow control (celeris#759)
…WriteTimeout is set, as the send drain's (celeris#759)
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Review comments at @src/content/docs/graceful-shutdown.md:
- Around line 300-304: Update the measured-results section in the
graceful-shutdown documentation to link the run record and identify its machine
or CI architecture; if no traceable run record is available, remove the
machine-specific byte counts.
- Line 264: Clarify the `Config.WriteTimeout` bound in the `h2PoolSettled`
documentation: the 250 ms minimum takes precedence when a positive
`WriteTimeout` is below 250 ms, and the wait is capped by `WriteTimeout` only
when it is at least 250 ms.
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These pages document the Celeris framework (goceleris/celeris, linked below).
⚙️ CodeRabbit configuration file
Files:
src/content/docs/core-concepts.mdsrc/content/docs/graceful-shutdown.md
Source excerpt: Benchmark provenance: Fail if the pull request adds or changes a benchmark figure (requests per second, a latency percentile, memory or CPU usage, or a ratio or percentage comparing Celeris with another framework) in src/con...
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src/content/docs/graceful-shutdown.md
[uncategorized] ~260-~260: Use a comma before “and” if it connects two independent clauses (unless they are closely connected and short).
Context: ...ction until those handlers have returned and their responses have gone out, respon...
(COMMA_COMPOUND_SENTENCE_2)
[misspelling] ~276-~276: Use “a” instead of ‘an’ if the following word doesn’t start with a vowel sound, e.g. ‘a sentence’, ‘a university’.
Context: ...n first; on std net/http, which hands an h2c connection over and stops tracking ...
(EN_A_VS_AN)
[misspelling] ~300-~300: Use “A” instead of ‘An’ if the following word doesn’t start with a vowel sound, e.g. ‘a sentence’, ‘a university’.
Context: ... one request in flight at the shutdown. An h2c request, on an .Async() route or ...
(EN_A_VS_AN)
🔀 Multi-repo context goceleris/celeris, goceleris/probatorium, goceleris/loadgen
Linked repositories findings
goceleris/celeris
server.go:526-542confirms the documented HTTP/2 behavior: GOAWAY, refusal of later streams, flow-controlled response draining, 250 ms minimum, and std h2c handler waiting. It also qualifies that io_uring continues accepting connections during its 250 ms send-drain phase.[::goceleris/celeris::]shutdown_h2_pool_linux_test.go:41-145, 541+directly tests GOAWAY ordering and completion of async/native HTTP/2 streams;shutdown_drain_order_linux_test.go:63-100covers std h2c and async-route shutdown ordering.[::goceleris/celeris::]
goceleris/probatorium
- The benchmark adapter pins Celeris
v1.5.12-0...inservers/celeris/go.mod:5-8, so its published benchmark cells are not evidence of the v1.6.0 shutdown behavior.[::goceleris/probatorium::] servers/celeris/server.go:112-152uses generic signal-triggeredsrv.Shutdownwith 10-second limits; the adapter does not expose shutdown-drain measurements or hook-order instrumentation.[::goceleris/probatorium::]
goceleris/loadgen
h2client.go:1098-1100, 1432-1435treats GOAWAY as connection failure, fails outstanding streams, and relies on reconnection during an active run. Thus loadgen’s normal request/error metrics are not a direct measure of handler completion or shutdown hook ordering.[::goceleris/loadgen::]
🔇 Additional comments (2)
src/content/docs/core-concepts.md (1)
90-91: LGTM!src/content/docs/graceful-shutdown.md (1)
27-28: LGTM!Also applies to: 234-235, 254-263, 265-265, 267-278, 323-323, 651-653
…er WriteTimeout (celeris#759)
1 participant
Matches goceleris/celeris#808 (fixes celeris#759), merged as goceleris/celeris@fe9264f. Rebased onto main 35f881c once #81 (celeris#760's docs, which edits the same section) had landed: the branch now carries only this PR's commits; the one conflict, in the pitfalls list, keeps #80's "do
Startand a cancelledStartWithContext" line.The drain now waits for every HTTP/2 stream: on epoll, io_uring and adaptive a stream on an async route runs on the shared HTTP/2 worker pool, and the shutdown now sends each HTTP/2 connection GOAWAY, refuses (
REFUSED_STREAM) a stream its client opens after it, and serves the connection until those handlers have returned and their responses have gone out, response data waiting for the client'sWINDOW_UPDATEincluded (while the shutdown's context is live, no longer thanConfig.WriteTimeoutwhile it is set, never less than 250 ms even with a shorter one); on std the drain waits for the h2c streams' handlers (up to the deadline). While the native engines wait for those handlers they accept no new connection (epoll closes its listeners when the shutdown begins, io_uring when the wait begins). The graceful-shutdown page listed both kinds of stream as exceptions ("It does not wait for two kinds of HTTP/2 stream"), and core-concepts pointed at them; they now describe v1.6.0 and keep the old behaviour as the pre-v1.6.0 note. The measured line gains the new result (every engine, h2c on an async route or not: the response arrived and the hooks ran after the handler; celeris PR #808,evidence/lanes-20260927/WRITE/759/logs/).Round 2 (celeris#808's review): the refused streams, the flow-controlled data, the listeners closed at once, and the no-deadline bound are added.
At merge: the HTTP/2 wait's
WriteTimeoutbound holds only whileWriteTimeoutis set (-1resolves to 0, and neither epoll'ssendDrainWaitnor io_uring'sh2PoolSettledcaps then), as #81 now says for the send drain. CodeRabbit (at merge): the 250 ms floor wins over a shorterWriteTimeout(both engines take the later end), now said too.