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Posted to commits@rocketmq.apache.org by "zmuxuny (via GitHub)" <gi...@apache.org> on 2026/09/17 18:13:11 UTC

[I] [Studio][Bug] Consumer connection lookup failures are reported as zero online clients [rocketmq-dashboard]

zmuxuny opened a new issue, #4543:
URL: https://github.com/apache/rocketmq-dashboard/issues/4543

   ### Before Creating the Bug Report
   
   - [x] I searched open/closed issues and PRs for consumer connection lookup failures, `onlineInstances`, Proxy fallback, and false zero-client diagnostics.
   - [x] I reproduced the behavior on current `master` (`d50ffecc9d7e8f8f46da64198831bd7952e6974e`).
   
   ### Problem
   
   Apache consumer-group live enrichment collapses connection-inventory failures into a normal empty connection set. `RocketMQMetadataProvider.resolveConsumerConnection` returns `null` after an unexpected Broker/NameServer error; the caller converts that to an empty instance list and `onlineInstances=0`.
   
   The Proxy fallback has the same ambiguity: `ProxyConsumerResolver` returns `null` both when every reachable Proxy explicitly reports `CONSUMER_NOT_ONLINE` and when Proxy discovery/query itself fails.
   
   ### Impact
   
   Consume stats may still be available and report positive lag while connection inventory is unavailable. Studio then publishes `onlineInstances=0`, so the web diagnostics can emit the critical finding “有堆积但无在线客户端”, and the AI group-detail tool can report the group UNHEALTHY, even though Studio never established that zero clients are online.
   ### Expected Behavior
   
   - Preserve `0` only when the connection inventory is actually available and confirms no clients.
   - Preserve Proxy-connected clients when Broker lookup reports the group offline.
   - Distinguish Proxy `CONSUMER_NOT_ONLINE` from discovery/query transport failures; RocketMQ Proxy explicitly returns that response code for a known offline group.
   - Represent unavailable connection inventory separately from zero clients so UI/AI diagnostics do not infer a consumer outage from a failed lookup.
   - Keep lag/consume-stat availability independent from connection-inventory availability.
   
   ### Red Reproduction
   
   A focused regression makes `examineConsumerConnectionInfo` fail with `nameserver unavailable` while `examineConsumeStats` still reports lag 40. On unmodified master, the expected unavailable online count is lost and the group is returned with `onlineInstances=0`.
   
   `RocketMQMetadataProviderTest`: **44 tests, exactly 1 failure** (`expected: -1 but was: 0`); the other 43 tests pass.
   ### Proposed Scope
   
   Use the existing negative-sentinel convention for `onlineInstances` (`-1` = unavailable), add an internal Proxy resolution status that distinguishes explicit offline from lookup failure, and teach web/AI health diagnostics not to treat unavailable connection data as zero.
   
   No persistence/schema change is required. Existing `resolveConsumerConnection` callers can keep the current nullable compatibility API while the group-health paths use the availability-aware result.
   
   AI-assisted source/protocol audit and regression authoring; the Broker/Proxy response paths and web/AI consumers were checked before filing.


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Re: [I] [Studio][Bug] Consumer connection lookup failures are reported as zero online clients [rocketmq-dashboard]

Posted by "lizhimins (via GitHub)" <gi...@apache.org>.
lizhimins commented on issue #4543:
URL: https://github.com/apache/rocketmq-dashboard/issues/4543#issuecomment-5759001070

   Resolved by #4544 (merged into rocketmq-studio as cd448e17f).


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Re: [I] [Studio][Bug] Consumer connection lookup failures are reported as zero online clients [rocketmq-dashboard]

Posted by "RockteMQ-AI (via GitHub)" <gi...@apache.org>.
RockteMQ-AI commented on issue #4543:
URL: https://github.com/apache/rocketmq-dashboard/issues/4543#issuecomment-5719785254

   **Issue Evaluation**
   
   Category: `bug` | Status: **Confirmed**
   
   The reported issue has been verified. The problem is well-documented with clear reproduction steps and a regression test.
   
   **Root Cause:** `RocketMQMetadataProvider.resolveConsumerConnection` returns `null` on unexpected Broker/NameServer errors, and the caller converts this to an empty instance list (`onlineInstances=0`). The Proxy fallback has the same ambiguity — it returns `null` both for explicit `CONSUMER_NOT_ONLINE` and for discovery/query failures.
   
   **Impact:** Studio diagnostics incorrectly report "有堆积但无在线客户端" (lag present but no online clients) when connection inventory is unavailable, leading to false UNHEALTHY assessments. This affects both web UI diagnostics and AI group-detail tool.
   
   **Severity:** High — user-visible data correctness issue affecting consumer group health monitoring.
   
   **Proposed Fix Scope:**
   - Use existing negative-sentinel convention (`onlineInstances=-1` for unavailable)
   - Add internal Proxy resolution status to distinguish explicit offline from lookup failure
   - Teach web/AI health diagnostics not to treat unavailable connection data as zero clients
   - Keep lag/consume-stat availability independent from connection-inventory availability
   
   An automated fix proposal will be generated. Reply `/approve` to proceed with PR generation.
   
   ---
   *Automated evaluation by github-manager*


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Re: [I] [Studio][Bug] Consumer connection lookup failures are reported as zero online clients [rocketmq-dashboard]

Posted by "lizhimins (via GitHub)" <gi...@apache.org>.
lizhimins closed issue #4543: [Studio][Bug] Consumer connection lookup failures are reported as zero online clients
URL: https://github.com/apache/rocketmq-dashboard/issues/4543


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