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[None][fix] Disaggregated client: bound streamed responses by silence, not total time - #21156
Symptom. In disaggregated serving, a streamed request whose generation runs longer than --request_timeout (trtllm-serve disaggregated -r, 180 s by default) is cut mid-stream while the generation worker is still producing tokens. Long agent turns are an example. The caller has already received a 200 and part of the SSE stream. The stream stops without its terminator (data: [DONE] for Chat Completions and Completions), and the disaggregated server logs a TimeoutError.
Cause. The disaggregated server calls its context and generation workers through OpenAIHttpClient. That client builds its aiohttp session with ClientTimeout(total=timeout_secs), where timeout_secs is --request_timeout. aiohttp's total budget also covers reading the response body. For a streamed response it therefore caps how long the generation may run, rather than detecting a stalled worker. Once the first chunk has been forwarded the client cannot retry, so the request fails.
Change.OpenAIHttpClient builds two timeouts and passes the matching one to the completion POST:
non-streamed request: ClientTimeout(total=T), as before.
post_json, get_json and the readiness checks keep the session default (total=T).
Contract change: what --request_timeout bounds.
Non-streamed worker request: the whole request, as before.
Streamed worker request: silence. The request fails in three cases:
connecting takes longer than T;
the response headers do not arrive within T of sending the request;
T seconds pass between two chunks.
A stream that keeps sending is never cut, however long it runs. Writing the request body is not covered by aiohttp's read timeout, so for a streamed request that phase is no longer bounded; before this change the total budget covered it.
Other uses of the value (coordinator calls, the clock-sync probes, the coordinator reservation floor): unchanged.
The --request_timeout help now says what the option bounds for a streamed response. The CLI reference (tests/unittest/api_stability/references/trtllm_serve_cli.yaml) records only type, default and status, so it does not change.
Coordinator reservations. This applies when several disaggregated server processes share a coordinator (num_workers > 1 or disagg_coordinator_url in the disaggregated config).
The coordinator releases any reservation older than max(TRTLLM_DISAGG_COORDINATOR_RESERVATION_TIMEOUT, default 180 s; --request_timeout). Before this change, a streamed request was cut before it reached that age; now it can outlive it.
When it does, the coordinator logs that it released a stale reservation and stops counting the request in its load. A KV-cache-aware router also does not record its routed blocks.
The stream itself completes normally, and its final finish is a no-op.
Deployments that expect longer streams can raise TRTLLM_DISAGG_COORDINATOR_RESERVATION_TIMEOUT.
Relation to #16402. Stale draft #16402 proposes one end-to-end deadline for a disaggregated request: it covers routing, both phases, retries and the response stream, and changes this option's help to "End-to-end disaggregated request timeout". The two bounds answer different questions, and they can coexist:
An end-to-end deadline caps how long a request may take in total, whatever it is doing.
A silence bound detects a worker that has stopped sending, usually long before a deadline would expire, and never cuts a stream that is still sending.
If an end-to-end deadline lands, it can wrap the whole pipeline (under its own option, or under this one with the silence bound under a new one), and the client keeps sock_read as the stall detector for each worker response. Both PRs edit the same --request_timeout help line.
Test Coverage
New class TestRequestTimeout in tests/unittest/disaggregated/test_disagg_openai_client.py. The file is CPU-only and collected by the unittest/disaggregated entry of l0_cpu.yml.
The first three tests run a real aiohttp server (aiohttp.test_utils.TestServer) as the worker. The client builds its own session, as the disaggregated server does, with timeout_secs=1.
Setup: a JSON body trickled over 2 s, never silent for more than 0.25 s.
Checks: it still times out at 1 s, and the request is finished once with success=False.
On main: passes. The test pins that a non-streamed request keeps its total bound.
test_a_streamed_request_still_bounds_connecting:
Checks: the streamed POST carries ClientTimeout(total=None, connect=180, sock_read=180).
On main: fails with KeyError: 'timeout'.
Results come from a local CPU run without the compiled bindings, with their steady clock replaced by time.monotonic. The stubbed clock otherwise breaks every streamed path, on main and on this branch alike.
test_disagg_openai_client.py: main has 111 passed and 2 failed (the two new tests marked "fails on main" above); this branch has 113 passed.
Serve-side disaggregated tests plus tests/unittest/api_stability/test_serve_cli.py, 635 tests in total. The disaggregated files are test_disagg_openai_client.py, test_openai_disagg_server.py, test_openai_disagg_service.py, test_coordinator_worker.py, test_router.py, test_disagg_responses_api.py, test_openai_server_stream_errors.py, test_disagg_internal_auth.py, test_msgspec_route.py, test_retirement_deadline.py, test_request_id.py, test_steady_clock_sync.py and test_disagg_utils.py.
The only outcome changes are those two tests, going from failed to passed.
Nothing that passes on main fails here.
The 26 failures in test_router.py and test_coordinator_worker.py are identical on both sides and come from the stubbed bindings.
Revert checks:
Removing the timeout= argument of the POST makes test_a_stream_longer_than_the_timeout_completes_while_data_keeps_arriving and test_a_streamed_request_still_bounds_connecting fail.
Dropping sock_read makes test_a_stream_silent_for_longer_than_the_timeout_fails fail.
Using the stream timeout for non-streamed requests too makes test_a_non_streamed_response_is_bounded_by_its_total_time fail.
PR Checklist
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Streamed requests use ClientTimeout(total=None, connect=T, sock_read=T). Non-streamed requests retain ClientTimeout(total=T). The CLI help now explains that a streamed response can exceed the timeout while data continues to arrive.
Streaming request-body writes are no longer covered by a total timeout. A long stream may outlive its coordinator reservation. Deployments that require longer streams may need to increase TRTLLM_DISAGG_COORDINATOR_RESERVATION_TIMEOUT.
QA Engineer Review
tests/unittest/disaggregated/test_disagg_openai_client.py adds seven timeout test methods. They cover active streams that exceed the timeout, read silence, delayed headers and body data with nonpositive timeouts, stalled request uploads, non-streamed total timeouts, streamed connection bounds, and response-start behavior. The connection-bound test checks the timeout passed to aiohttp; it does not simulate a slow connection.
The author reports 113 passing tests in test_disagg_openai_client.py on this branch, compared with 111 passing and two failing on main. Across 635 serve-side disaggregated and CLI tests, the author reports those two tests were the only outcome changes. The author also reports 26 identical failures in test_router.py and test_coordinator_worker.py, attributed to stubbed bindings. CI results are mixed: one GitHub run succeeded, one merge-request pipeline failed with reduced test coverage, and the outcome of a later GitHub run is not provided. The test file is not an integration test, and no matching entry was found in the searched integration test lists. Coverage verdict: sufficient.
Per-File QA Perspective
tensorrt_llm/commands/serve.py: Verify that the --request_timeout help text accurately describes streamed-response silence behavior.
tensorrt_llm/serve/openai_client.py: Verify that streamed requests have no total timeout and retain connection and socket-read bounds. Verify that non-streamed requests retain a total timeout, and account for streaming request-body writes no longer being covered by the total timeout.
tests/unittest/disaggregated/test_disagg_openai_client.py: Covers active and silent streams, stalled uploads, non-streamed total timeouts, and nonpositive timeout behavior. The connection-bound test checks aiohttp configuration rather than a slow connection; no integration test-list entry applies.
…, not total time
The disaggregated server's worker client built its aiohttp session with
ClientTimeout(total=request_timeout). aiohttp's total budget also covers
reading the response body, so a streamed response that was still producing
tokens was cut once it had run for --request_timeout seconds (180 by
default): the caller's SSE body stopped without its terminator, and the
client could not retry because part of the stream had already been
forwarded.
A streamed request now uses ClientTimeout(total=None, connect=T,
sock_read=T): it fails when connecting takes longer than T or when the
worker sends nothing for T seconds, however long the stream runs. A
non-streamed request keeps ClientTimeout(total=T). The --request_timeout
help says what the option bounds for a stream.
Signed-off-by: JunyiXu-nv <219237550+JunyiXu-nv@users.noreply.github.com>
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Worker requests now use separate timeout policies for streamed and non-streamed responses. The CLI help describes streamed timeout behavior, and local worker tests cover the policies.
The client bounds response startup and selects timeout settings based on whether a request streams its response. The CLI help states that a stream can continue while data arrives and times out after a period without data.
Local worker tests cover streams that exceed the configured timeout while data continues, silent streams, stalled uploads, non-streamed responses that exceed the total timeout, and non-positive timeout values.
sequenceDiagram
participant Client as OpenAIHttpClient
participant Worker as Local worker
participant Router as Request router
Client->>Worker: Send request with streaming or total timeout policy
Worker-->>Client: Return headers and response data
Client->>Router: Report request completion or timeout
Loading
Possibly related PRs
NVIDIA/TensorRT-LLM#21061: Emits keepalive frames while a Responses stream is silent. These frames can count as incoming data under the streamed request timeout policy.
Suggested reviewers: schetlur-nv
Merge Risk: Moderate · previous review 79dc1
Long-running streams can outlive their coordinator reservations, causing incorrect worker accounting and cache bookkeeping. Connection-timeout enforcement also lacks a real delayed-connection test; resolve these before merging.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title clearly and concisely describes the main change: streamed responses are limited by silence intervals instead of a total timeout.
Description check
The description fully explains the issue, cause, implementation, timeout contract, coordinator behavior, and test coverage. It includes the required Description and Test Coverage sections. The checkli…
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The description fully explains the issue, cause, implementation, timeout contract, coordinator behavior, and test coverage. It includes the required Description and Test Coverage sections. The checklist is only partially completed, but the missing items are non-critical for this assessment.
Full details: Docstring Coverage
Explanation
Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 10 functions across 3 files.
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
Exercise the connection deadline, not only its configuration.
mock_session.post never attempts a connection. The real-server tests connect to an already-listening TestServer, so they cover stream duration and read silence, but not delayed connection establishment. Add a bounded test with a real aiohttp session whose connector waits beyond the configured deadline. Keep the configuration assertion.
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Review comment at @tests/unittest/disaggregated/test_disagg_openai_client.py
around lines 1350 - 1354:
Extend the test around the streaming request to exercise connection
establishment with a real aiohttp session and a connector that delays beyond the
configured connection deadline; assert that the request times out. Keep the
existing timeout-configuration assertion, and bound the test so the delayed
connection cannot hang the suite.
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Inline comments:
Review comments at @tensorrt_llm/serve/openai_client.py:
- Around line 238-240: Update the ClientTimeout configuration in the streamed
POST client setup to bound request-body sending separately, without restoring a
total timeout that would limit the response stream. Keep the existing connection
and socket-read timeouts intact.
- Around line 238-240: Update the delegated streaming flow associated with
`_stream_timeout` to renew the coordinator reservation while chunks are actively
received, preventing reservation expiry before the stream completes; add a
regression test that keeps a stream active beyond the reservation interval and
verifies its load accounting remains reserved.
---
Nitpick comments:
Review comments at @tests/unittest/disaggregated/test_disagg_openai_client.py:
- Around line 1350-1354: Extend the test around the streaming request to
exercise connection establishment with a real aiohttp session and a connector
that delays beyond the configured connection deadline; assert that the request
times out. Keep the existing timeout-configuration assertion, and bound the test
so the delayed connection cannot hang the suite.
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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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…uded
aiohttp starts its sock_read timer only once the request body is fully
written, so with no total bound a worker that stopped reading a large
streamed request could hold it open indefinitely. Entering each worker
POST (connecting, sending the request, receiving the response headers)
is now bounded by timeout_secs; after that a stream is still bounded by
silence only. A zero timeout still disables the bound, as in aiohttp.
Tests: a 32 MiB streamed request to a worker that does not read it fails
after the timeout, and a zero timeout leaves the response start unbounded.
Signed-off-by: JunyiXu-nv <219237550+JunyiXu-nv@users.noreply.github.com>
@coderabbitai Re the nitpick on exercising the connection deadline: not taken. The connect bound is aiohttp's own, and the test pins that it is passed. Exercising a real slow connect would need aiohttp's private connector methods or a deliberately exhausted connection pool. Connecting is now also inside the response-start bound added for the other comment, and that bound is tested against a real worker, so the two cover each other.
Make the zero-timeout assertion check the response-start bound.
The immediate mock response succeeds even if zero incorrectly selects a positive response-start timeout. Assert that _ResponseStartBound passes None to asyncio.wait_for. This will catch a regression that silently restores a finite bound. As per path instructions, “Flag assertions that would pass despite a plausible regression.”
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Review comment at @tests/unittest/disaggregated/test_disagg_openai_client.py
around lines 1399 - 1401:
Update the zero-timeout test around `client.send_request` to assert that
`_ResponseStartBound` passes `None` to `asyncio.wait_for`, so the test detects a
regression to a finite response-start timeout.
Source: Path instructions
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Inline comments:
Review comments at @tensorrt_llm/serve/openai_client.py:
- Around line 261-272: Normalize timeout_secs in OpenAIHttpClient.__init__
before creating _non_stream_timeout, _stream_timeout, and
_response_start_timeout_secs so zero and negative values all disable the
timeout; keep positive values as the configured bound for each policy.
---
Nitpick comments:
Review comments at @tests/unittest/disaggregated/test_disagg_openai_client.py:
- Around line 1399-1401: Update the zero-timeout test around
`client.send_request` to assert that `_ResponseStartBound` passes `None` to
`asyncio.wait_for`, so the test detects a regression to a finite response-start
timeout.
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@JunyiXu-nv Understood. The assertion that connect is passed to aiohttp, together with the real-worker test of the response-start bound, is sufficient for this concern. I withdraw the request for a separate slow-connect test.
📝 I couldn't check this conversation for new learnings, so no new learning was saved.
… too
asyncio.wait_for cancels at once for any timeout at or below zero, while
aiohttp treats such a timeout as none. A negative request timeout now
disables the response-start bound like zero does. The test runs 0 and -1
and checks that no bound reaches wait_for.
Signed-off-by: JunyiXu-nv <219237550+JunyiXu-nv@users.noreply.github.com>
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Actionable comments posted: 1
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @tensorrt_llm/serve/openai_client.py:
- Line 269: Normalize timeout_secs before assigning _stream_timeout.connect and
sock_read, using None for non-positive values so disabled timeouts cannot
trigger immediate stream timeouts. Add a real-worker regression test with
timeout_secs=-1 that streams data and completes successfully.
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Resource maintenance in LLM/main/L0_Test-x86_64-Single-GPU #4107: L40S-PyTorch-2 is temporarily paused due to Kubernetes agent provisioning and node issues. Affected stages: L40S-PyTorch-2
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Inline comments:
Review comments at @tests/unittest/disaggregated/test_disagg_openai_client.py:
- Around line 1299-1301: Update the streaming test around the delayed response
writes to verify that the ClientTimeout passed to post disables both connect and
sock_read for each tested value; avoid relying on the short delays as evidence
that the timeout bounds are disabled.
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Description
Symptom. In disaggregated serving, a streamed request whose generation runs longer than
--request_timeout(trtllm-serve disaggregated -r, 180 s by default) is cut mid-stream while the generation worker is still producing tokens. Long agent turns are an example. The caller has already received a 200 and part of the SSE stream. The stream stops without its terminator (data: [DONE]for Chat Completions and Completions), and the disaggregated server logs aTimeoutError.Cause. The disaggregated server calls its context and generation workers through
OpenAIHttpClient. That client builds its aiohttp session withClientTimeout(total=timeout_secs), wheretimeout_secsis--request_timeout. aiohttp'stotalbudget also covers reading the response body. For a streamed response it therefore caps how long the generation may run, rather than detecting a stalled worker. Once the first chunk has been forwarded the client cannot retry, so the request fails.Change.
OpenAIHttpClientbuilds two timeouts and passes the matching one to the completion POST:ClientTimeout(total=None, connect=T, sock_read=T);ClientTimeout(total=T), as before.post_json,get_jsonand the readiness checks keep the session default (total=T).Contract change: what
--request_timeoutbounds.Non-streamed worker request: the whole request, as before.
Streamed worker request: silence. The request fails in three cases:
A stream that keeps sending is never cut, however long it runs. Writing the request body is not covered by aiohttp's read timeout, so for a streamed request that phase is no longer bounded; before this change the total budget covered it.
Other uses of the value (coordinator calls, the clock-sync probes, the coordinator reservation floor): unchanged.
The
--request_timeouthelp now says what the option bounds for a streamed response. The CLI reference (tests/unittest/api_stability/references/trtllm_serve_cli.yaml) records only type, default and status, so it does not change.Coordinator reservations. This applies when several disaggregated server processes share a coordinator (
num_workers > 1ordisagg_coordinator_urlin the disaggregated config).TRTLLM_DISAGG_COORDINATOR_RESERVATION_TIMEOUT, default 180 s;--request_timeout). Before this change, a streamed request was cut before it reached that age; now it can outlive it.Deployments that expect longer streams can raise
TRTLLM_DISAGG_COORDINATOR_RESERVATION_TIMEOUT.Relation to #16402. Stale draft #16402 proposes one end-to-end deadline for a disaggregated request: it covers routing, both phases, retries and the response stream, and changes this option's help to "End-to-end disaggregated request timeout". The two bounds answer different questions, and they can coexist:
If an end-to-end deadline lands, it can wrap the whole pipeline (under its own option, or under this one with the silence bound under a new one), and the client keeps
sock_readas the stall detector for each worker response. Both PRs edit the same--request_timeouthelp line.Test Coverage
New class
TestRequestTimeoutintests/unittest/disaggregated/test_disagg_openai_client.py. The file is CPU-only and collected by theunittest/disaggregatedentry ofl0_cpu.yml.The first three tests run a real aiohttp server (
aiohttp.test_utils.TestServer) as the worker. The client builds its own session, as the disaggregated server does, withtimeout_secs=1.test_a_stream_longer_than_the_timeout_completes_while_data_keeps_arriving:success=True.TimeoutErrorafter 1 s.test_a_stream_silent_for_longer_than_the_timeout_fails:success=False.test_a_non_streamed_response_is_bounded_by_its_total_time:success=False.test_a_streamed_request_still_bounds_connecting:ClientTimeout(total=None, connect=180, sock_read=180).KeyError: 'timeout'.Results come from a local CPU run without the compiled bindings, with their steady clock replaced by
time.monotonic. The stubbed clock otherwise breaks every streamed path, on main and on this branch alike.test_disagg_openai_client.py: main has 111 passed and 2 failed (the two new tests marked "fails on main" above); this branch has 113 passed.tests/unittest/api_stability/test_serve_cli.py, 635 tests in total. The disaggregated files aretest_disagg_openai_client.py,test_openai_disagg_server.py,test_openai_disagg_service.py,test_coordinator_worker.py,test_router.py,test_disagg_responses_api.py,test_openai_server_stream_errors.py,test_disagg_internal_auth.py,test_msgspec_route.py,test_retirement_deadline.py,test_request_id.py,test_steady_clock_sync.pyandtest_disagg_utils.py.test_router.pyandtest_coordinator_worker.pyare identical on both sides and come from the stubbed bindings.timeout=argument of the POST makestest_a_stream_longer_than_the_timeout_completes_while_data_keeps_arrivingandtest_a_streamed_request_still_bounds_connectingfail.sock_readmakestest_a_stream_silent_for_longer_than_the_timeout_failsfail.test_a_non_streamed_response_is_bounded_by_its_total_timefail.PR Checklist
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Dev Engineer Review
Streamed requests use
ClientTimeout(total=None, connect=T, sock_read=T). Non-streamed requests retainClientTimeout(total=T). The CLI help now explains that a streamed response can exceed the timeout while data continues to arrive.Streaming request-body writes are no longer covered by a total timeout. A long stream may outlive its coordinator reservation. Deployments that require longer streams may need to increase
TRTLLM_DISAGG_COORDINATOR_RESERVATION_TIMEOUT.QA Engineer Review
tests/unittest/disaggregated/test_disagg_openai_client.pyadds seven timeout test methods. They cover active streams that exceed the timeout, read silence, delayed headers and body data with nonpositive timeouts, stalled request uploads, non-streamed total timeouts, streamed connection bounds, and response-start behavior. The connection-bound test checks the timeout passed to aiohttp; it does not simulate a slow connection.The author reports 113 passing tests in
test_disagg_openai_client.pyon this branch, compared with 111 passing and two failing on main. Across 635 serve-side disaggregated and CLI tests, the author reports those two tests were the only outcome changes. The author also reports 26 identical failures intest_router.pyandtest_coordinator_worker.py, attributed to stubbed bindings. CI results are mixed: one GitHub run succeeded, one merge-request pipeline failed with reduced test coverage, and the outcome of a later GitHub run is not provided. The test file is not an integration test, and no matching entry was found in the searched integration test lists. Coverage verdict: sufficient.Per-File QA Perspective
tensorrt_llm/commands/serve.py: Verify that the--request_timeouthelp text accurately describes streamed-response silence behavior.tensorrt_llm/serve/openai_client.py: Verify that streamed requests have no total timeout and retain connection and socket-read bounds. Verify that non-streamed requests retain a total timeout, and account for streaming request-body writes no longer being covered by the total timeout.tests/unittest/disaggregated/test_disagg_openai_client.py: Covers active and silent streams, stalled uploads, non-streamed total timeouts, and nonpositive timeout behavior. The connection-bound test checks aiohttp configuration rather than a slow connection; no integration test-list entry applies.