dosubot[bot] commented on issue #3124: URL: https://github.com/apache/hugegraph/issues/3124#issuecomment-5117464447
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I verified the claims against the current codebase and can confirm the analysis is accurate across all points. **DNS TTL**: `start-hugegraph.sh` defaults `OPEN_SECURITY_CHECK="true"` [[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-dist/src/assembly/static/bin/start-hugegraph.sh#L19-L21), and `hugegraph-server.sh` adds `-Djava.security.manager=org.apache.hugegraph.security.HugeSecurityManager` when that flag is set [[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-dist/src/assembly/static/bin/hugegraph-server.sh#L142-L145). There is no `networkaddress.cache.ttl` or `sun.net.inetaddr.ttl` anywhere in the startup scripts or configuration files, confirming the JVM will cache DNS forever under the SecurityManager. **Channel caching**: `AbstractGrpcClient` stores channels in a static `ConcurrentHashMap<String, ManagedChannel[]>` with no eviction, shutdown, or health-check path [[3]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/grpc/AbstractGrpcClient.java#L40-L45). Once created, channels persist for the lifetime of the JVM. **Retry loop**: `retryingInvoke()` retries up to `NODE_MAX_RETRYING_TIMES` with back-off but never invalidates sessions, stubs, channels, or DNS state between attempts [[4]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/NodeTxExecutor.java#L369-L405). Sessions are cached by node ID and only cleared by explicit commit/rollback cleanup [[5]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/NodeTxExecutor.java#L266-L276). **No UNAVAILABLE handling**: `NotifyingExecutor` catches transport failures generically and reports `HgNodeStatus.NOT_WORK`, but does not inspect `StatusRuntimeException.getStatus().getCode()` and has no `UNAVAILABLE`-specific recovery [[6]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/grpc/NotifyingExecutor.java#L76-L83). It only branches on application-level `FeedbackRes` status codes [[7]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/grpc/NotifyingExecutor.java#L85-L107). **Node metadata never refreshed**: `HgStoreNodeManager.applyNode()` returns the cached `nodeIdMap` entry immediately on a node ID hit and never consults the provider again [[8]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/HgStoreNodeManager.java#L109-L133). `addNode()` also returns the existing entry rather than replacing it [[9]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/HgStoreNodeManager.java#L195-L211). So even if PD returns an updated address for the same node ID, it's ignored. There are no existing issues or PRs addressing DNS caching or gRPC channel staleness specifically, though there are related HStore lifecycle issues around stale state — e.g., `init_complete` flag loss on pod restart [[10]](https://github.com/apache/hugegraph/issues/3118) and `wait-storage.sh` binding to a single PD peer [[11]](https://github.com/apache/hugegraph/issues/3123) — which suggest a broader pattern of operational fragility in Kubernetes deployments. The suggested `-Dsun.net.inetaddr.ttl=30` workaround as a chart-level fix is sound for Java 11 with SecurityManager, and the distinction between the security property vs. system property behavior is correct. The optional Store-client hardening suggestions (UNAVAILABLE-specific handling, channel eviction, node metadata refresh) would provide defense-in-depth beyond the DNS fix. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](<https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=apache%2Fhugegraph>).* --- Docs are dead. Just use [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-tagline&utm_term=apache%2Fhugegraph). 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