{"record":{"id":"1b53690a7a0e3018","repo":"dgraph-io/dgraph","slug":"group-id-is-zero-in-v","errorCode":null,"errorMessage":"Group ID is Zero in %+v","messagePattern":"Group ID is Zero in %\\+v","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"dgraph/cmd/zero/zero.go","lineNumber":419,"sourceCode":"\t\t\ttablets = append(tablets, dstTablet)\n\t\t}\n\t}\n\n\tif len(tablets) > 0 {\n\t\tres = append(res, &pb.ZeroProposal{Tablets: tablets})\n\t}\n\treturn res, nil\n}\n\nfunc (s *Server) Inform(ctx context.Context, req *pb.TabletRequest) (*pb.TabletResponse, error) {\n\tctx, span := otel.Tracer(\"\").Start(ctx, \"Zero.Inform\")\n\tdefer span.End()\n\tif req == nil || len(req.Tablets) == 0 {\n\t\treturn nil, errors.Errorf(\"Tablets are empty in %+v\", req)\n\t}\n\n\tif req.GroupId == 0 {\n\t\treturn nil, errors.Errorf(\"Group ID is Zero in %+v\", req)\n\t}\n\n\ttablets := make([]*pb.Tablet, 0)\n\tunknownTablets := make([]*pb.Tablet, 0)\n\tfor _, t := range req.Tablets {\n\t\ttab := s.ServingTablet(t.Predicate)\n\t\tspan.SetAttributes(attribute.String(\"tablet_predicate\", t.Predicate))\n\t\tswitch {\n\t\tcase tab != nil && !t.Force:\n\t\t\ttablets = append(tablets, t)\n\t\tcase t.ReadOnly:\n\t\t\ttablets = append(tablets, &pb.Tablet{})\n\t\tdefault:\n\t\t\tunknownTablets = append(unknownTablets, t)\n\t\t}\n\t}\n\n\tif len(unknownTablets) == 0 {","sourceCodeStart":401,"sourceCodeEnd":437,"githubUrl":"https://github.com/dgraph-io/dgraph/blob/759e242be62c91f8d084da06ad0c8d21256d9c07/dgraph/cmd/zero/zero.go#L401-L437","documentation":"Error returned by the Zero server (dgraph/cmd/zero/zero.go) when a server instance that is configured as Zero (with group ID 0 / acting as Zero) appears in a context where it is unexpected, e.g. during membership or grouping checks. The server state is printed via %+v. Fix by ensuring server configuration/assignments are consistent with the cluster membership.","triggerScenarios":"Calling Zero's Inform gRPC with a TabletRequest whose GroupId field is left unset (0) — e.g., struct built without filling GroupId, or an Alpha that hasn't yet been assigned to a group.","commonSituations":"Hand-written clients using zero.pb omitting GroupId; an Alpha started without membership assignment (never joined a group) reporting tablets; tests constructing TabletRequest literals missing the field.","solutions":["Set req.GroupId to the Alpha's assigned group before calling Inform (obtain it from Zero's /state or the membership response).","Ensure the Alpha completed group assignment/leader election before reporting tablets.","In custom clients, validate GroupId > 0 prior to the gRPC call.","Check Alpha logs to confirm it joined a group (member.GroupId nonzero) at startup."],"exampleFix":"// before\nreq := &pb.TabletRequest{Tablets: tablets}\n// after\nif member.GroupId == 0 {\n    return errors.New(\"alpha not yet assigned to a group\")\n}\nreq := &pb.TabletRequest{Tablets: tablets, GroupId: member.GroupId}","handlingStrategy":"validation","validationCode":"if req.GroupId == 0 {\n    return errors.New(\"GroupId must be set to the alpha's assigned group\")\n}","typeGuard":"func hasValidGroupId(req *pb.TabletRequest) bool {\n    return req != nil && req.GroupId > 0\n}","tryCatchPattern":"resp, err := zeroClient.Inform(ctx, req)\nif err != nil && strings.Contains(err.Error(), \"Group ID is Zero\") {\n    req.GroupId = fetchAssignedGroupFromState()\n    resp, err = zeroClient.Inform(ctx, req)\n}","preventionTips":["Always initialize TabletRequest from the Alpha's member state (which carries GroupId).","Wait for group assignment before reporting tablets.","Add a startup assertion that member.GroupId != 0.","Use struct literals that name every field (no positional/zero-value omissions)."],"tags":["zero","grpc","validation","group-id"],"backgroundTag":"missing-required-argument","analyzedSha":"759e242be62c91f8d084da06ad0c8d21256d9c07","analyzedAt":"2026-09-01T14:42:12.034Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}