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feat(global-router): add the Global Discovery HTTP service - #17371
Adds the Global Discovery HTTP service: the global-discovery-service binary, which serves the pool discovery library from #17331 over HTTP.
POST /pools: a PoolRelay registers its pool. It calls this on a timer, and each call is also the pool's heartbeat.
GET /pools: the pools a Global Router routes to.
GET /routers: the Global Router replicas a PoolRelay connects to.
POST /routers: to register Router Replicas. Not needed for the MCS/Karmada discovery method. Will return 501 for registration method (gRCP APIs)
GET /healthz: readiness.
Two flags choose the backend behind the API:
--pool-discovery says where the pool and router lists come from: registrations (the default: the pools PoolRelays register, and the router replicas given with --router), or what MCS imports, named the Karmada way (karmada) or the standard way (mcs). These two are the values of the operator's mcsImplementation in feat(operator): export Global Router pools through the Multi-Cluster Services API #17412. With karmada, it lists the pools whose PoolRelay Services Karmada imports, and the Global Router replicas from the router Service's imported EndpointSlices. PoolRelay Services are now named <DGD name>-pool-relay; the POC used a relay- prefix.
--registration-storage says where registrations are kept: only memory for now. DynamoDB or Kubernetes can come later.
--help groups the flags that work with only some --pool-discovery values. Such a flag given with another value fails at startup, and so do karmada and mcs without --router-namespace, --router-service and --router-port-name, or with one of them empty. With karmada, so does a router Service name longer than Karmada imports (55 characters). In the library, the service reads and writes through PoolDiscoveryBackend, the backend behind the API.
Builds on #17331, which is merged. This is the version of #16714 that goes to main, by way of #15949.
HTTP server from #17178
The first commit copies lib/http-server (dynamo-http-server) unchanged from #17178 (by Ishan Dhanani and Sachal Malick, credited in the commit). The second commit is the service itself. The server gives it optional TLS (--tls-cert-path, --tls-key-path), and on shutdown it lets requests in flight finish.
The crate is identical in both PRs. Whichever lands second drops its copy, its lib/http-server workspace member and its dynamo-http-server key.
As in the frontend, DYN_HTTP_GRACEFUL_SHUTDOWN_TIMEOUT_SECS and DYN_HTTP_WRITE_IDLE_TIMEOUT_SECS apply, and its lifecycle log lines say "frontend".
mTLS is left out until dynamo-global-discovery-client can present a client certificate.
Left out: checking who calls POST /pools. V1 trusts the network, so nothing used the caller. A pool's relay_identities, for routers to admit its PoolRelays, still come from MCS.
An invalid pool key or a blank model in POST /pools gets 422, like any other invalid body, because both are checked while the JSON is read.
POST /pools refuses a body over 64 KiB with 413. A registration is a few hundred bytes, and the storage keeps each one for its lease.
With --pool-discovery karmada or mcs, pools are listed without a model or frontends, and POST /pools answers 501 whatever the body, because only MCS feeds the list. feat(global-router): read pool models from registrations, not a file #17332 adds both: registrations joined with MCS, and frontends from each pool's frontend Service.
The Kubernetes client connects within 10 s and waits at most 75 s for the API server to answer, not kube's defaults of 30 s and 295 s. The MCS watches end after 50 s, so a working watch never reaches the read timeout, and a server that stops answering shows up as watch errors in time for the staleness rule in feat(global-router): add the Global Discovery Service library (contract and backends) #17331. A compile-time check keeps the two under 90 s.
The Kubernetes client connects to the API server directly. With a kubeconfig, kube takes a proxy from HTTPS_PROXY, ignoring NO_PROXY, and this build has no proxy support.
The example manifest listens on [::]:8080, for IPv4 and IPv6 pods, and meets the restricted Pod Security level. CI's filters ignore it and the Dockerfile, since no CI job builds or deploys them yet.
Validation
cargo test -p dynamo-global-discovery-service: 59 passed: the 39 from feat(global-router): add the Global Discovery Service library (contract and backends) #17331, the HTTP API, its body limit and shutdown, the real client against it, and the binary's flags: the defaults, a flag for another --pool-discovery value, the router flags MCS needs and their values, --pool-service-suffix parsing, --router URLs, the Karmada name limit and the lease bound. Breaking the refusal, dropping a flag's heading or requirement, swapping the modes, or moving the body limit either way fails a test.
cargo clippy --all-targets -- -D warnings and cargo fmt on the three crates: clean. cargo doc with -D warnings passes for the service crate. The copied lib/http-server has two rustdoc warnings, left as copied.
Ran the binary with --pool-discovery registrations: registered a pool with curl, then checked GET /pools, GET /routers and /healthz. A lease over a day or not longer than the heartbeat, a repeated --router, a flag for another --pool-discovery value, karmada without the --router-* flags or with one empty, a router Service over 55 characters with karmada, a --router URL without http://, and a --pool-service-suffix with no value are refused at startup, with clap's usage and exit code 2. SIGTERM exits 0.
Ran it with the manifest's arguments: it serves, /healthz answers 503 until it can reach a cluster, and SIGTERM exits 0. With a kubeconfig and HTTPS_PROXY set, it starts and logs only the proxy's host. POST /pools answers 501 to an empty or non-JSON body. The manifest parses, and build_codeowners.py --strict passes.
The image is not built here. The Dockerfile's build command passes locally with --locked (without --release), and the binary links only the C and C++ runtime libraries that the image installs.
An adversarial review of the flag change ran before the push. Its findings are fixed: the backend type is PoolDiscoveryBackend, since dynamo_runtime already has a DiscoveryBackend; a flag for another mode is refused whatever sets it, and a test checks that every flag says which modes it works with; clap requires the router flags with MCS; and the 501 answer no longer names MCS.
Added a Global Discovery Service that can report router and pool information through HTTP endpoints, with Kubernetes-based discovery and optional pool registration.
Added health checks and optional TLS for the discovery service.
Added HTTP server support for TLS, graceful shutdown, request tracking, and configurable body and write timeouts.
Documentation
Clarified that pool discovery can report multiple active replicas and how routers interpret those reports.
…ts share
dynamo-global-common holds the types that more than one Global Router
component needs, so each is defined once:
- a pool's identity and location (PoolKey, PoolId and its deriver,
PoolLocation), from the shared crate on the global-router-v2 test branch;
- the JSON of the Global Discovery Service's HTTP API: the POST /pools body
and its lease reply, and the pool and router lists. Today the service and
its client each define these;
- how a router names a PoolRelay on a trusted network (address_identity),
which the service writes into each pool's relay_identity;
- Global Router replicas, and list-and-watch events and snapshots, which
the service and the client in #17208 both define today.
The JSON does not change. PoolKey now reads and writes
{"site_id", "namespace", "dgd_name"} and checks each field while reading.
A lease reply parses only when the heartbeat interval is above zero and
below the lease, as in the client in #17208, and the lease is at most a
day.
Co-authored-by: Sachal Malick <s@chal.ai>
Co-authored-by: Jacob Ioffe <jioffe@nvidia.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
Review feedback: the comments on `round_trip`, `PoolLocation` and
`Snapshot` repeated the name or the fields right below them.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
…c comments
- A `POST /pools` body with an empty or blank `model` no longer parses, as
with an invalid pool key, so the PoolRelay gets a 422 instead of
registering a pool that no request can match.
- The crate docs said the service writes the API's JSON and its clients
read it; the registration body goes the other way.
- `pool.rs` no longer refers to a source adapter that is not on main, or
calls the V1 derivation the POC one.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
The one-day cap made the shared `Lease` stricter than the client in #17208:
once that client reads the shared type, a reply with a longer lease would
fail to parse. The cap only protects the service's own clock arithmetic, so
the service now bounds the lease it grants (#17371), and `Lease` keeps the
checks a client needs: the interval is above zero and below the lease.
Also drops `LeaseError`'s doc comment, which restated its use.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
A pool's listing named its PoolRelay by one address. On a dual-stack
cluster the PoolRelay's pod has two, and it connects to a router from
whichever family the router's address uses, so a router matching one
address could turn the right PoolRelay away. `relay_identities` now lists
each of them.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
1 job failed: in vllm-runtime / Test cuda13.0, amd64, 46 vLLM worker/handler unit tests failed in the parallel CPU-only pytest stage, which was then terminated at ~99% (~10 min after start, the cpu_only_test_timeout_minutes: 10 budget) before pytest printed tracebacks. The CPU e2e and GPU stages in the same job passed. Attempt 1 of this run reported the same 46-test failure in the same five files.
❌ vllm-runtime / Test cuda13.0, amd64: 46 vLLM handler unit tests FAILED, pre_merge_cpu stage killed at ~10 min
Job: vllm-runtime / Test cuda13.0, amd64 · Failed step: Run CPU-only tests (parallelized) · Logs: gh run view --job 125437062810 -R ai-dynamo/dynamo --log-failed
17:32:19 ▶️ Executing (cwd=/workspace): python -m pytest -n auto --dist=loadscope ... (pre_merge_cpu)
[gw13] [ 21%] FAILED components/src/dynamo/vllm/tests/test_vllm_handoff_consumer.py::test_handler_rejects_external_result_in_text_mode
[gw10] [ 26%] FAILED components/src/dynamo/vllm/tests/test_vllm_worker_handler.py::test_generate_captures_artifact_without_emitting_raw_routes
...
[gw7] [ 99%] PASSED tests/frontend/test_realtime_omni_bridge.py::test_websocket_audio_round_trip
17:42:18 ##[error]Executing the custom container implementation failed. Please contact your self hosted runner administrator.
...
❌ pre_merge_cpu: step outcome 'failure'
✅ pre_merge_cpu_e2e: pytest exited 0
⏭️ pre_merge_gpu_parallel: did not run
✅ pre_merge_gpu: pytest exited 0
##[error]A pytest stage did not record a passing result. See this step's log for the stage.
46 tests failed (each after 3 Datadog auto-retries), all in five components/src/dynamo/vllm/tests/ files: test_vllm_elastic_ep_handlers.py (19), test_vllm_worker_handler.py (17), test_vllm_sleep_wake_handlers.py (5), test_vllm_engine_monitor_stats.py (4) and test_vllm_handoff_consumer.py (1). The step was terminated ~10 minutes after pytest started (runner reported "Executing the custom container implementation failed"), so the short test summary and assertion tracebacks were never printed. To see the errors, run one of these files locally, e.g. python3 -m pytest components/src/dynamo/vllm/tests/test_vllm_elastic_ep_handlers.py -q, or check the Datadog test-runs report for this pipeline.
round_trip fails unless the parsed value serializes back to the same
JSON, so the field assertions after it could not catch anything more.
A lease of u64::MAX seconds already shows that a lease has no upper
bound, so the 48-hour case goes too.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
dynamo-global-discovery-service starts as a library: which Global Router
pools exist, and which Global Router replicas a PoolRelay connects to.
Following the Global Router coding standards:
- The contract comes first: the store traits in pool_discovery
(PoolDirectory, PoolRegistrar, ReplicaDirectory), on the
dynamo-global-common types.
- The stores sit below it: in memory (registrations with leases), and MCS
(pools and router replicas from the EndpointSlices that Karmada or a
standard MCS implementation imports).
The HTTP service that serves them is added separately.
The code is the discovery work from #15933 and #15949, in the crate layout
of the global-router-v2 test branch. It leaves out the router-side pieces
those PRs had (relay admission, state connections, router discovery
modes): routers now read pools from the service, and relay connections
belong to the router.
Co-authored-by: Sachal Malick <s@chal.ai>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
- When the EndpointSlice watch keeps failing, for example after its RBAC is
removed, the cache served its last view as complete indefinitely. It
still serves that view, and the service stays ready, but after a minute
of failures it reports the view as Estimated, so GET /pools says
"complete": false, and it logs the failures as errors.
- A misnamed router port, Service or namespace left GET /routers empty with
nothing in the log. A router EndpointSlice without the named port is now
logged, and so is a relist that lists nothing, which also catches a
cluster without the expected ServiceImports.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
… list
Review feedback:
- list_and_watch returns a stream that yields nothing until the first
complete list. That is deliberate, as dynamo_runtime's Kubernetes
discovery also waits to be ready, but it was undocumented. The cancel
token ends the wait, and the watch's failures are logged.
- The error logged after a minute of watch failures claimed to list the
last view as incomplete even before there was a view.
- A test comment only restated the next line.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
…ache
- The watcher's lists, including its relists after a watch error, were
quorum reads from etcd (kube's default, ListSemantic::MostRecent), paged
500 at a time. They now use any_semantic(): the API server answers from
its watch cache, and the watch catches up from there. Discovery needs
nothing stronger, and the pool watch covers every imported EndpointSlice
in the cluster.
- The one list made before the cache syncs uses match_any() for the same
reason.
- The pool and router indexes each had a copy of the Ready filter; both now
use one ready_endpoints helper.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
… them
The previous commit asked the watcher for lists from the API server's
cache with any_semantic(), but kube sends resourceVersion=0 only when no
page size is set, and the watcher pages 500 at a time by default. Its
lists therefore stayed paged quorum reads from etcd. With paging off they
are served from the watch cache in one response, as client-go's reflector
lists. The cache keeps only what it derives from each slice, so the larger
response costs little.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
… who makes it
The MCS store's module doc said the operator creates each PoolRelay
Service's `ServiceExport`, but no operator code does. It now says what the
store needs, and what `relay_identity` is for: routers do not check it yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
From an independent review against the Global Router coding standards:
- A failing EndpointSlice watch is now reported correctly. The cache
cleared its failure clock on `Init`, which kube sends before each relist
attempt, so a list that kept failing never made the view `Estimated`.
And kube resumes a watch without an event, so after one error a healthy
watch turned `Estimated` a minute later. Now errors spanning a minute
mark the view stale, and two minutes without one count as recovery.
`Init` no longer reaches kube's backoff, which it reset, so a failing
list backs off instead of retrying every 800 ms.
- `register` takes the `PoolRegistration` a PoolRelay sends and returns
the `Lease`, and pools are listed as `PoolListing`. The store's own
record type and its unused revision are gone.
- A pool binds to a PoolRelay pod and lists every address of it in
`relay_identities`, so a dual-stack PoolRelay matches from either family.
A router replica in an IPv4 and an IPv6 slice is served at its IPv4
address, whatever the slices are named.
- The memory store reports a list as exact once a lease has passed since
it started.
- With Karmada, a Service name over 57 characters loses its cluster from
the slice names. Such slices are now logged rather than skipped silently,
and the limit is documented.
- `hub`, `endpoints` and `mcs` are private. `EndpointSliceReplicaDirectory`
is `McsReplicaDirectory` with `new`, `PoolDiscoveryError` is
`DiscoveryError`, the store types implement `Debug`, and the contract's
docs no longer name stores or HTTP routes.
- A relist no longer copies the whole view to check whether it is empty.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
A list's completeness says whether it may be missing items, and
`GET /pools` passes it on as `complete`. The contract now says what a
caller that keeps its own pool list does with each: replace on a complete
list, merge a partial one and keep missing pools, and still use a partial
list when it knows no pools yet. The design link points at the DEP issue,
#17600, since enhancements #103 is closed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
…lags are
The same fixes#17371 made to its flags, for the flags this PR adds:
- A `--frontend-service-suffix` left without a value no longer takes the
next flag as the suffix. A suffix that starts with `-` goes after `=`.
- `--frontend-port-name` and the `--peer-*` flags cannot be empty.
- With `karmada`, a `--peer-service` longer than Karmada can import fails
at startup, as `--router-service` does.
- `--peer-service` with `--tls-cert-path`, and a lease of at most two
heartbeats with `--peer-service`, get clap's usage and exit code 2
instead of exiting 1 from `main`.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
A pool runs active-active PoolRelay replicas: each reports to every Global
Router, and routers dedupe the overlapping reports, as the operator's
DynamoPoolRelay runs two pods and #17686 keeps their reports apart. The
MCS backend bound only the Ready pod with the lowest address, so routers
matching relay_identities would admit one replica and refuse the other.
It now lists every Ready PoolRelay pod by each of its addresses, sorted,
so every service instance lists the same identities. A pool stays live
while any PoolRelay endpoint is Ready, and a pod that stops being Ready
leaves the listing. An IPv4-mapped IPv6 address counts as its IPv4
address, so a pod is never listed twice under one identity. The pods were
grouped by targetRef only to choose one, so the grouping is gone.
PoolListing::relay_identities now says it names every replica, and the
memory store says that replicas registering one pool should send the same
registration.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
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No P0 or P1 found. This review has one P2 and one P3. It covers head b844440338d5bdfa4f42af449befe1c71c19ff52 as its own diff on top of #17331. It also covers a local merge of both PRs into main at ba9caeac492cdeef00fbb6096ae6efda40f81064, which merges without conflicts.
Findings:
[P2] POST /pools keeps bodies of up to 2 MiB for their lease, and nothing caps the number of pools. lib/global-discovery-service/src/service.rs:66. The measurements and a tested diff are on the existing thread there.
[P3] The test counts in the Validation section predate the newest commit of #17331. At this head, cargo test -p dynamo-global-discovery-service passes 58 tests: 48 in the library, 39 of them from #17331, and 10 in main.rs. The description says 55, with 37 from #17331. Please update it.
Open items from other reviewers:
service.rs:62: this head has no client_ca field. serve passes tls_client_ca_cert_path: None at line 90, and the description says that mTLS is left out.
service.rs:163: the readiness wording in the module doc.
lib/http-server/src/server.rs:208: the --http-port text. The service passes its own listener, so it never reaches that branch.
lib/http-server is a copy from #17178. All 9 files match #17178 at 09532874562b1b7a08a75b579f5b26080be29695 byte for byte, and both PRs add the same owner lines for lib/http-server. Both PRs also add the lib/http-server workspace member and the dynamo-http-server key. A merge of the two heads lists the member twice and conflicts on that key. So the PR that merges second needs to drop its copy and those two lines.
Tests, lock file, owners and CI filters.
cargo test --locked: 58 passed for dynamo-global-discovery-service and 56 for dynamo-http-server. They pass on the head, and on merges with main at 3057891245 and at ba9caeac49.
Changing service.rs:116 so that a rejected body answers 200 fails invalid_key_is_rejected and a_registration_must_be_json.
cargo tree --locked passes on the head and on both merges. The lock adds one local package, dynamo-http-server, and no crate from a registry.
emit_codeowners.py regenerates CODEOWNERS and CONTRIBUTORS.md byte for byte on the head and on the merge with 3057891245. build_codeowners.py --strict passes on the full tree and with --changed-only.
who_owns.py: the service files and the manifest go to @ai-dynamo/dynamo-global-router-codeowners. The Dockerfile goes to that team and @ai-dynamo/dynamo-ops-codeowners. lib/http-server/ goes to @ai-dynamo/dynamo-frontend-codeowners, with @ai-dynamo/dynamo-observability-codeowners added for metrics.rs.
.github/filters.yaml: the two new paths are under ignore, so a change to only the Dockerfile or the manifest starts no CI job. The edit to filters.yaml itself matches the ci filter, so this PR also runs the core, deploy, frontend, operator and power_agent jobs. The Deploy Test, Power Agent and operator jobs ran on this head, and not on #17331.
CI at this head, at the time of this review: one Pre Merge run passed, with the Rust tests, clippy and operator. A second Pre Merge run was queued. In the PR run, sglang-runtime / Test cuda13.0, amd64 and sglang Deploy Test / agg_embed were still running, and the other jobs passed. Three jobs of duplicate runs were cancelled.
The binary on 127.0.0.1, with each route and each startup check.
--pool-discovery registrations: GET /healthz, GET /routers and GET /pools answer 200, and a valid POST /pools answers 200 with the lease.
POST /pools answers 422 for a key field that is blank, empty or holds a control character, and for a model of the same kind. It also answers 422 for a missing or null field, a wrong type, a negative workers, and a frontend that is not a URL. An unknown field is accepted.
POST /pools answers 400 for broken JSON or an empty body, and 415 without Content-Type: application/json. POST /routers answers 501 with its reason. Other methods answer 405.
With a 1 s heartbeat and a 3 s lease, each pool left GET /pools within 3.5 s of its last registration. The complete field changed from false to true, as the 3 s lease predicts.
Each flag mistake in the description exits with code 2 and clap's message. This includes a lease over 86,400 s, a heartbeat not below the lease, a repeated --router, and a --router URL without http://. It also includes a flag for the other --pool-discovery value and missing or empty --router-* flags. A 56-character --router-service with karmada and a --pool-service-suffix without a value also exit with code 2.
--pool-discovery karmada with a kubeconfig that points to a closed local port: /healthz, GET /pools and GET /routers answer 503, and POST /pools answers 501 for a valid body, no body and a non-JSON body. With HTTPS_PROXY=http://user:<password>@proxy.invalid:3128, the log names proxy.invalid and not the password.
SIGTERM exits 0 in every run.
The service records no metrics, so no metric label comes from a request.
From a request, only the 400 and 422 bodies echo text: the error from serde, which names the field path and, for a wrong type, the value. A 1.9 MB string in workers came back in a 1,900,141-byte 422 body. The only bound is the 2 MiB body limit. The service logs nothing from a request.
The image from the Dockerfile in this PR, built on a Linux host, and the example manifest.
docker buildx build -f container/Dockerfile.global-discovery-service . passes. Its cargo build --locked --release finished in 2m 34s, and the image has 100,201,866 bytes.
The bases resolved to rust:1.96.1-trixie@sha256:1f0dbad1df66647807e6952d1db85d0b2bda7606cb2139d82517e4f009967376 and debian:trixie-slim@sha256:f6b08b09a05725f9431502d3b5714f5c4576e82c1a84fa1debe0c24a7e0c3ec4. They are pinned by tag, as in the other Dockerfiles in container/.
The image runs as uid=10001 gid=0. ldd lists only libgcc_s, libm and libc, and sleep exists for the preStop hook.
With a read-only root filesystem, all capabilities dropped and no-new-privileges, the image serves in registrations mode.
The image also runs with the arguments of the manifest and a kubeconfig that points to a closed local port. It then answers 503 on /healthz and 501 on POST /pools. docker stop exits 0 in both runs.
The manifest sets each field that the restricted Pod Security level checks: runAsNonRoot, seccompProfile: RuntimeDefault, allowPrivilegeEscalation: false and capabilities.drop: ["ALL"]. It uses no host namespace, host port or volume.
POST /pools took bodies of up to axum's default of 2 MiB, and the
backend keeps each registration for its lease. A registration is a few
hundred bytes, so the routes now refuse a body over 64 KiB with 413
before it reaches the backend. A test sends one body at the limit and
one a byte over it.
The module doc now says that ready does not mean the pool list is
complete: GET /pools says that in `complete`.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
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Reviewed at b844440338d5bdfa4f42af449befe1c71c19ff52, as its own diff on top of #17331. Also reviewed on a local merge of both PRs into main at ba9caeac492cdeef00fbb6096ae6efda40f81064, which has no conflicts.
Tests: 58 for the service and 56 for dynamo-http-server pass on both trees. A deliberate break of the rejection path in service.rs fails two tests.
lib/http-server matches #17178 at 09532874562b1b7a08a75b579f5b26080be29695 byte for byte. The lock adds no crate from a registry, and CODEOWNERS regenerates byte for byte.
The binary: every route answers as the description says, a lease runs out on time, each startup check exits with code 2, and SIGTERM exits 0.
The image builds with --locked --release, runs as 10001:0 with a read-only root filesystem, and serves with the arguments of the manifest.
Open items: the P2 on service.rs:66 (each stored registration can hold up to 2 MiB, and nothing caps the number of stored pools), and the stale test counts in the description. The threads of estroz are also open. lib/http-server exists twice until #17178 or this PR merges and the other drops its copy and its two Cargo.toml lines.
Base automatically changed from
atchernych/global-discovery-service to
mainOctober 31, 2026 04:19
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Walkthrough
This change adds a Global Discovery Service with in-memory and Kubernetes MCS discovery backends, an HTTP API, an executable, and deployment resources. It also adds a reusable HTTP server crate with lifecycle tracking, request and load types, optional TLS, and connection timeout handling.
Changes
Global Discovery Service
Layer / File(s)
Summary
Discovery contracts and in-memory backend lib/global-common/src/discovery.rs, lib/global-discovery-service/Cargo.toml, lib/global-discovery-service/src/{backends.rs,lib.rs,pool_discovery.rs}, lib/global-discovery-service/src/pool_discovery/*, lib/global-discovery-service/src/backends/{memory.rs,stream.rs}
Defines pool, replica, registration, directory, and watch contracts. Adds an in-memory pool store, a static replica directory, and shared list-and-watch stream behavior. Updates the relay identity documentation for active-active PoolRelay replicas.
Adds Standard and Karmada EndpointSlice selection, shared caching and watch recovery, and MCS-backed pool and router-replica directories. The directories index slice updates and relists and include tests for filtering, aggregation, completeness, and watch behavior.
HTTP API and executable lib/global-discovery-service/src/{service.rs,main.rs}
Adds pool and router listing, pool registration, health checks, response limits, backend error handling, CLI validation, backend selection, TLS setup, and signal-driven shutdown.
Deployment and repository integration container/{Dockerfile.global-discovery-service,global-discovery-service.yaml}, .github/{filters.yaml,codeowners/areas.yaml}, CODEOWNERS
Adds a multi-stage service image and a Kubernetes deployment with EndpointSlice access. Updates CI ignore paths and ownership mappings for the new service resources.
HTTP Server Crate
Layer / File(s)
Summary
Crate setup and request/load types Cargo.toml, lib/http-server/Cargo.toml, lib/http-server/src/{lib.rs,load.rs,request.rs}, .github/codeowners/areas.yaml, CODEOWNERS
Adds lib/http-server to the workspace and declares dynamo-http-server. Adds serializable load types, request body and JSON content-type helpers, public module declarations, and ownership mappings.
Lifecycle and disconnect tracking lib/http-server/src/{lifecycle.rs,disconnect.rs}
Adds service readiness and shutdown stages, inflight request tracking through response completion, request-ID propagation, and connection-disconnect monitoring.
HTTP transport and write deadlines lib/http-server/src/{server.rs,write_timeout.rs}
Adds HTTP and optional TLS serving, graceful draining, listener configuration, connection deadlines, and stalled-write timeouts. Tests cover transport configuration and timeout behavior.
The example deployment command in the manifest header fails when run from the repository root because it omits the container/ directory. This is easy to fix and does not affect the service itself. The change is otherwise ready to merge.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 48.84% 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. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
Check name
Status
Explanation
Title check
The title clearly and concisely identifies the main change: adding the Global Discovery HTTP service.
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Description check
The description follows the template's main ideas but does not use its headings. It has a summary, key behavior notes, and validation. It covers the features, flags, the HTTP API, the copied HTTP serv…
Full details: Description check
Explanation
The description follows the template's main ideas but does not use its headings. It has a summary, key behavior notes, and validation. It covers the features, flags, the HTTP API, the copied HTTP server crate, and the testing performed. It does not contain the 'Overview', 'Key Changes', 'Validation', and 'Issues and Ongoing Work' headings. The 'Closes #XXXX' issue link is missing. The PR links #17600 only as the DEP it is part of, so the issue-closing line is absent. The Pull Request Checklist item (use of the /pr-checklist skill) is not shown as checked or mentioned. Overall the content is substantive and mostly complete, so the check passes, but the template structure and the checklist are missing.
Resolution
Optionally, rename or reorganize the sections to match the template headings: Overview, Key Changes, Validation, and Issues and Ongoing Work. Add a 'Closes #XXXX' line under Issues and Ongoing Work, or state that the PR is advisory for issue linking. Add the Pull Request Checklist block and confirm the /pr-checklist skill was used.
Full details: Docstring Coverage
Explanation
Docstring coverage is 48.84% 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 86 functions across 24 files. (8 skipped: 8 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @container/global-discovery-service.yaml:
- Line 6: Update the deployment command’s manifest path in the comment to use
container/global-discovery-service.yaml, so it works when run from the
repository root and matches the build command’s working directory.
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#17331 is in main as one squashed commit, so its files came from both
sides. Main has not changed them since, so this branch's versions, which
add the HTTP service to them, stand. Cargo.lock is main's, plus
dynamo-http-server and the service's new dependencies. CODEOWNERS
regenerates unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
The example apply command named global-discovery-service.yaml, which
works only from container/. It now names
container/global-discovery-service.yaml, so it runs from the repository
root, like the build command in the Dockerfile.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
Eric, on #17178: it is still a draft, so this PR will likely land first. Then #17178 drops its copy of lib/http-server, plus its own lib/http-server workspace member and dynamo-http-server key. Dmitry checked that the nine files match #17178 at 0953287, so dropping them is clean. If #17178 lands first, this PR drops them instead.
Dmitry, the P2 is answered in its thread, and the description's test counts are updated: 59 passed, 49 in the library (39 of them from #17331) and 10 for the binary.
#17331 is merged, so this PR now targets main, and 88c07e4 merges main into it. The conflicts were in the files from #17331, which came from both sides; main has not changed them since, so this PR's versions stand. Cargo.lock is main's, plus dynamo-http-server and the service's new dependencies.
Brings in main, which now has #17371 (squash-merged as b751c95).
This branch already had all of #17371 through 7f61b37, so the four
files that conflicted keep this branch's version: the manifest,
backends/kubernetes.rs, main.rs and service.rs. Main has not changed
them since #17371, so the merged tree is main plus this branch's own
changes, and nothing else.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Anna Tchernych <atchernych@nvidia.com>
…Discovery Service
Adds `--registration-storage dynamodb` as an alternative to `memory` for
`--pool-discovery registrations`. Registrations live in one DynamoDB
table that any number of service replicas share, in one region or across
regions through a Global Table, so the service survives restarts and
lists `complete: true` from its first read.
One item per pool key; `register` is one unconditional UpdateItem
(last writer wins, as with the memory store); leases are evaluated at
read time on the reader's clock with a skew allowance; the TTL attribute
is garbage collection only; `list_and_watch` polls the table and diffs.
Six new flags under the registrations heading, a `Clock` abstraction for
deterministic tests, a conformance suite shared with the memory store,
dynamodb-local integration tests gated by GDS_TEST_DYNAMODB_ENDPOINT, a
crate README, a design doc, two docs-site pages, an example manifest and
code ownership.
Relates to #17371
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Signed-off-by: Eric Stroczynski <estroczynski@nvidia.com>
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Summary
Adds the Global Discovery HTTP service: the
global-discovery-servicebinary, which serves the pool discovery library from #17331 over HTTP.POST /pools: a PoolRelay registers its pool. It calls this on a timer, and each call is also the pool's heartbeat.GET /pools: the pools a Global Router routes to.GET /routers: the Global Router replicas a PoolRelay connects to.POST /routers: to register Router Replicas. Not needed for the MCS/Karmada discovery method. Will return 501 forregistrationmethod (gRCP APIs)GET /healthz: readiness.Two flags choose the backend behind the API:
--pool-discoverysays where the pool and router lists come from:registrations(the default: the pools PoolRelays register, and the router replicas given with--router), or what MCS imports, named the Karmada way (karmada) or the standard way (mcs). These two are the values of the operator'smcsImplementationin feat(operator): export Global Router pools through the Multi-Cluster Services API #17412. Withkarmada, it lists the pools whose PoolRelay Services Karmada imports, and the Global Router replicas from the router Service's imported EndpointSlices. PoolRelay Services are now named<DGD name>-pool-relay; the POC used arelay-prefix.--registration-storagesays where registrations are kept: onlymemoryfor now. DynamoDB or Kubernetes can come later.--helpgroups the flags that work with only some--pool-discoveryvalues. Such a flag given with another value fails at startup, and so dokarmadaandmcswithout--router-namespace,--router-serviceand--router-port-name, or with one of them empty. Withkarmada, so does a router Service name longer than Karmada imports (55 characters). In the library, the service reads and writes throughPoolDiscoveryBackend, the backend behind the API.Builds on #17331, which is merged. This is the version of #16714 that goes to main, by way of #15949.
Part of #17600, the pool discovery DEP.
HTTP server from #17178
The first commit copies
lib/http-server(dynamo-http-server) unchanged from #17178 (by Ishan Dhanani and Sachal Malick, credited in the commit). The second commit is the service itself. The server gives it optional TLS (--tls-cert-path,--tls-key-path), and on shutdown it lets requests in flight finish.lib/http-serverworkspace member and itsdynamo-http-serverkey.DYN_HTTP_GRACEFUL_SHUTDOWN_TIMEOUT_SECSandDYN_HTTP_WRITE_IDLE_TIMEOUT_SECSapply, and its lifecycle log lines say "frontend".dynamo-global-discovery-clientcan present a client certificate.dynamo-llm.Behavior
POST /pools. V1 trusts the network, so nothing used the caller. A pool'srelay_identities, for routers to admit its PoolRelays, still come from MCS.modelinPOST /poolsgets422, like any other invalid body, because both are checked while the JSON is read.POST /poolsrefuses a body over 64 KiB with413. A registration is a few hundred bytes, and the storage keeps each one for its lease.--pool-discovery karmadaormcs, pools are listed without a model or frontends, andPOST /poolsanswers501whatever the body, because only MCS feeds the list. feat(global-router): read pool models from registrations, not a file #17332 adds both: registrations joined with MCS, and frontends from each pool's frontend Service.--lease-duration-secsrefuses more than a day. The sharedLeaseno longer caps it (feat(global-router): add a crate for types the Global Router components share #17330), so that a client follows any lease it is given, but the service still needs a bound: the registration storage adds the lease to the current time.HTTPS_PROXY, ignoringNO_PROXY, and this build has no proxy support.[::]:8080, for IPv4 and IPv6 pods, and meets therestrictedPod Security level. CI's filters ignore it and the Dockerfile, since no CI job builds or deploys them yet.Validation
cargo test -p dynamo-global-discovery-service: 59 passed: the 39 from feat(global-router): add the Global Discovery Service library (contract and backends) #17331, the HTTP API, its body limit and shutdown, the real client against it, and the binary's flags: the defaults, a flag for another--pool-discoveryvalue, the router flags MCS needs and their values,--pool-service-suffixparsing,--routerURLs, the Karmada name limit and the lease bound. Breaking the refusal, dropping a flag's heading or requirement, swapping the modes, or moving the body limit either way fails a test.cargo test -p dynamo-http-server: 56 passed, as in refactor(http): extract server core and separate chat inference #17178.cargo clippy --all-targets -- -D warningsandcargo fmton the three crates: clean.cargo docwith-D warningspasses for the service crate. The copiedlib/http-serverhas two rustdoc warnings, left as copied.--pool-discovery registrations: registered a pool withcurl, then checkedGET /pools,GET /routersand/healthz. A lease over a day or not longer than the heartbeat, a repeated--router, a flag for another--pool-discoveryvalue,karmadawithout the--router-*flags or with one empty, a router Service over 55 characters withkarmada, a--routerURL withouthttp://, and a--pool-service-suffixwith no value are refused at startup, with clap's usage and exit code 2. SIGTERM exits 0./healthzanswers 503 until it can reach a cluster, and SIGTERM exits 0. With a kubeconfig andHTTPS_PROXYset, it starts and logs only the proxy's host.POST /poolsanswers501to an empty or non-JSON body. The manifest parses, andbuild_codeowners.py --strictpasses.--locked(without--release), and the binary links only the C and C++ runtime libraries that the image installs.PoolDiscoveryBackend, sincedynamo_runtimealready has aDiscoveryBackend; a flag for another mode is refused whatever sets it, and a test checks that every flag says which modes it works with; clap requires the router flags with MCS; and the501answer no longer names MCS.🤖 Generated with Claude Code
Summary by CodeRabbit