{"record":{"id":"6bb510fc581703e4","repo":"vitessio/vitess","slug":"the-tablet-alias-argument-is-required-for-the-pi","errorCode":null,"errorMessage":"the <tablet alias> argument is required for the Ping command","messagePattern":"the <tablet alias> argument is required for the Ping command","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"go/vt/vtctl/vtctl.go","lineNumber":1175,"sourceCode":"\t\t\treturn fmt.Errorf(\"failed reading tablet %v: %v\", tabletAlias, err)\n\t\t}\n\t\tif !topo.IsTrivialTypeChange(ti.Type, newType) {\n\t\t\treturn fmt.Errorf(\"invalid type transition %v: %v -> %v\", tabletAlias, ti.Type, newType)\n\t\t}\n\t\twr.Logger().Printf(\"- %v\\n\", fmtTabletAwkable(ti))\n\t\tti.Type = newType\n\t\twr.Logger().Printf(\"+ %v\\n\", fmtTabletAwkable(ti))\n\t\treturn nil\n\t}\n\treturn wr.ChangeTabletType(ctx, tabletAlias, newType)\n}\n\nfunc commandPing(ctx context.Context, wr *wrangler.Wrangler, subFlags *pflag.FlagSet, args []string) error {\n\tif err := subFlags.Parse(args); err != nil {\n\t\treturn err\n\t}\n\tif subFlags.NArg() != 1 {\n\t\treturn errors.New(\"the <tablet alias> argument is required for the Ping command\")\n\t}\n\ttabletAlias, err := topoproto.ParseTabletAlias(subFlags.Arg(0))\n\tif err != nil {\n\t\treturn err\n\t}\n\t_, err = wr.VtctldServer().PingTablet(ctx, &vtctldatapb.PingTabletRequest{\n\t\tTabletAlias: tabletAlias,\n\t})\n\treturn err\n}\n\nfunc commandRefreshState(ctx context.Context, wr *wrangler.Wrangler, subFlags *pflag.FlagSet, args []string) error {\n\tif err := subFlags.Parse(args); err != nil {\n\t\treturn err\n\t}\n\tif subFlags.NArg() != 1 {\n\t\treturn errors.New(\"the <tablet alias> argument is required for the RefreshState command\")\n\t}","sourceCodeStart":1157,"sourceCodeEnd":1193,"githubUrl":"https://github.com/vitessio/vitess/blob/01a25a7d176f94613b8d59d799f438380a8760e4/go/vt/vtctl/vtctl.go#L1157-L1193","documentation":"This error is raised by the vtctl commandPing handler when the Ping command is not supplied exactly one positional argument. Ping is a trivial connectivity/liveness check that requires the <tablet alias> of the tablet to ping through the vtctld server. The handler validates the count before parsing the alias and issuing PingTablet.","triggerScenarios":"Running `vtctl Ping` with zero arguments or with more than one positional argument (NArg() != 1).","commonSituations":"Assuming Ping is argument-less (like a health check on self); empty alias variable in scripts; extra tokens accidentally appended.","solutions":["Re-run with exactly one alias: `vtctl Ping zone1-0000000100`.","Ensure the alias is a single token with no trailing spaces that could split.","Check scripts for an empty alias variable before calling Ping.","See `vtctl Ping --help`."],"exampleFix":"// before\nvtctl Ping\n// after\nvtctl Ping zone1-0000000100","handlingStrategy":"validation","validationCode":"alias=\"zone1-0000000100\"\nif [ -z \"$alias\" ] || [ $# -ne 1 ]; then\n  echo \"usage: vtctl Ping <tablet alias>\" >&2\n  exit 2\nfi\nvtctl Ping \"$alias\"","typeGuard":null,"tryCatchPattern":"out, err := exec.Command(\"vtctl\", \"Ping\", alias).CombinedOutput()\nif err != nil {\n    if strings.Contains(string(out), \"argument is required for the Ping\") {\n        return fmt.Errorf(\"Ping takes exactly one alias arg\")\n    }\n    return err\n}","preventionTips":["Remember Ping requires the tablet alias; it is not argument-less.","Trim whitespace from alias variables to avoid splitting/empty args.","Keep the alias as a single quoted token.","Consult --help when composing new commands."],"tags":["vtctl","cli","missing-argument","ping"],"backgroundTag":"missing-required-cli-argument","analyzedSha":"01a25a7d176f94613b8d59d799f438380a8760e4","analyzedAt":"2026-09-01T17:28:30.605Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}