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Posted to issues@hugegraph.apache.org by "dosubot[bot] (via GitHub)" <gi...@apache.org> on 2026/09/02 11:14:57 UTC
Re: [I] [Bug] PD /v1/health reports healthy without a raft quorum; add a quorum-aware readiness signal [hugegraph]
dosubot[bot] commented on issue #3183:
URL: https://github.com/apache/hugegraph/issues/3183#issuecomment-5508662745
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@bitflicker64 — your analysis checks out against the code on master. `checkHealthy()` returns a bare empty 200 with zero raft awareness [[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/rest/StoreAPI.java#L382-L384), exactly as you described.
The building blocks for a quorum-aware endpoint already exist in `RaftEngine`:
- [`isLeader()`](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/raft/RaftEngine.java#L198-L200) gives a per-node "am I the leader" check, and [`getLeader()` → `raftNode.getLeaderId()`](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/raft/RaftEngine.java#L227-L229) tells whether the node knows who the leader is at all.
- [`getMembers()`](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/raft/RaftEngine.java#L301-L306) is what backs `/v1/members` today — it lists peers, resolves their gRPC addresses, and tags each with a role and state. That endpoint sits behind auth because the [interceptor exclusion list](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/rest/interceptor/AuthenticationConfigurer.java#L35) only covers `/actuator/*`, `/v1/health`, and `/v1/prom/targets/*`.
- On the metrics side, [`PDMetrics.registerMeters()`](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/metrics/PDMetrics.java#L68-L80) registers only `hg.up` (hardcoded to 1), `hg.graphs`, `hg.stores`, and `hg.terms`. There is no leader gauge and no reachable-member count. `hg.terms` is a partition-term counter (`setTerms()`), not a raft-quorum signal, confirming it can't substitute for one.
This is the continuation of the gap flagged in #3123, which explicitly suggested "splitting liveness from readiness… with readiness backed by something raft-aware such as `RaftEngine.getLeaderGrpcAddress()`" [[2]](https://github.com/apache/hugegraph/issues/3123). #3129 then fixed the `wait-storage.sh` peer-pinning problem by probing `/v1/stores` across every peer on each retry [[3]](https://github.com/apache/hugegraph/pull/3129), but as you note that only fixed peer stickiness — a storeless/leaderless PD still answers 200 to `/v1/health`.
A related effort in #3136 requests raft-lag and recovery metrics on the Store side [[4]](https://github.com/apache/hugegraph/issues/3136), which is a good precedent for how a leader/quorum gauge could be shaped on PD, though it doesn't cover PD's own raft state. I didn't find an existing PR or issue that adds the `/v1/ready` endpoint or the leader/quorum gauges specifically, so this appears to be new ground.
Given that `isLeader()`, `getLeader()`, and `getMembers()` already exist in `RaftEngine`, option 2 (a dedicated unauthenticated `/v1/ready`) looks straightforward — it would call those existing methods and skip auth the same way `/v1/health` already does. Pairing that with option 3 (a `hg.pd.leader` gauge and a `hg.pd.reachable_members` counter in `PDMetrics`) would give both the programmatic readiness gate and the alerting signal operators need.
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