{"record":{"id":"cbefd0ad227747ff","repo":"vitessio/vitess","slug":"discovervtgates-cluster-s-w","errorCode":null,"errorMessage":"DiscoverVTGates(cluster = %s): %w","messagePattern":"DiscoverVTGates\\(cluster = (.+?)\\): %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"go/vt/vtadmin/cluster/cluster.go","lineNumber":1158,"sourceCode":"\n\tresp, err := c.Vtctld.GetCellsAliases(ctx, &vtctldatapb.GetCellsAliasesRequest{})\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\treturn &vtadminpb.ClusterCellsAliases{\n\t\tCluster: c.ToProto(),\n\t\tAliases: resp.Aliases,\n\t}, nil\n}\n\n// GetGates returns the list of all VTGates in the cluster.\nfunc (c *Cluster) GetGates(ctx context.Context) ([]*vtadminpb.VTGate, error) {\n\t// (TODO|@ajm188) Support tags in the vtadmin RPC request and pass them\n\t// through here.\n\tgates, err := c.Discovery.DiscoverVTGates(ctx, []string{})\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"DiscoverVTGates(cluster = %s): %w\", c.ID, err)\n\t}\n\n\t// This overwrites any Cluster field populated by a particular discovery\n\t// implementation.\n\tcpb := c.ToProto()\n\n\tfor _, g := range gates {\n\t\tg.Cluster = cpb\n\t}\n\n\treturn gates, nil\n}\n\n// GetKeyspace returns a single keyspace in the cluster.\nfunc (c *Cluster) GetKeyspace(ctx context.Context, name string) (*vtadminpb.Keyspace, error) {\n\tspan, ctx := trace.NewSpan(ctx, \"Cluster.GetKeyspace\")\n\tdefer span.Finish()\n","sourceCodeStart":1140,"sourceCodeEnd":1176,"githubUrl":"https://github.com/vitessio/vitess/blob/01a25a7d176f94613b8d59d799f438380a8760e4/go/vt/vtadmin/cluster/cluster.go#L1140-L1176","documentation":"VTAdmin's Cluster wraps any failure from the discovery implementation's DiscoverVTGates call with the cluster ID for context. Discovery backends (e.g. vtsql) query the topo to list VTGate servers; if that query fails, this wrap preserves the underlying cause. It is a contextual wrapper, not a distinct failure mode.","triggerScenarios":"Calling cluster.GetGates(ctx) when the discovery backend cannot list gates: topo connection failure, invalid discovery config (e.g. wrong vtctld/vtgate address), or authentication failure against the topo server.","commonSituations":"vtadmin started before the topo is reachable; misconfigured --topo flags or discovery implementation (vtsql) DSN; network partition between vtadmin and topo; read-only topo credentials lacking permission to list gates.","solutions":["Verify vtadmin's topo/discovery configuration (discovery implementation, addresses, credentials) and test connectivity from the vtadmin host","Check the wrapped cause (the %w error) for the specific topo error and fix that first","Ensure the topo server is running and reachable (etcd/zk health)","Retry GetGates once the topo connection is restored"],"exampleFix":"// before\ngates, err := c.Discovery.DiscoverVTGates(ctx, []string{})\n// after — check discovery config & topo health first, then\nif err != nil {\n\tlog.Warn(\"discover vtgates failed\", slog.Any(\"error\", err))\n\treturn nil, fmt.Errorf(\"DiscoverVTGates(cluster = %s): %w\", c.ID, err)\n}","handlingStrategy":"try-catch","validationCode":"// Go: check connectivity to the topo before calling\nif err := pingTopo(ctx, clusterCfg); err != nil {\n\treturn fmt.Errorf(\"topo unreachable before DiscoverVTGates: %w\", err)\n}","typeGuard":null,"tryCatchPattern":"gates, err := c.GetGates(ctx)\nif err != nil {\n\tif strings.Contains(err.Error(), \"DiscoverVTGates(cluster =\") {\n\t\t// inspect wrapped cause with errors.Unwrap; likely topo/discovery config\n\t\treturn nil, retryable(err)\n\t}\n\treturn nil, err\n}","preventionTips":["Validate discovery/topo configuration at vtadmin startup","Add health checks for topo (etcd/zk) before API readiness","Log the unwrapped cause, not just the wrapper","Alert on discovery failures to catch topo outages early"],"tags":["vtadmin","discovery","topology","network"],"backgroundTag":"topo-discovery-failed","analyzedSha":"01a25a7d176f94613b8d59d799f438380a8760e4","analyzedAt":"2026-09-01T17:28:30.605Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}