{"record":{"id":"9a31111eda8228dc","repo":"vitessio/vitess","slug":"getschema-v-nil-v-v-failed-v","errorCode":null,"errorMessage":"GetSchema(%v, nil, %v, %v) failed: %v","messagePattern":"GetSchema\\((.+?), nil, (.+?), (.+?)\\) failed: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"go/vt/vtctl/grpcvtctldserver/server.go","lineNumber":5087,"sourceCode":"\t\t\t\terrMessage := fmt.Sprintf(\"FindAllTabletAliasesInShard(%v, %v) failed: %v\", keyspace, shard, err)\n\t\t\t\tresp.ResultsByShard[shard].Results = append(resp.ResultsByShard[shard].Results, errMessage)\n\t\t\t\tresp.Results = append(resp.Results, errMessage)\n\t\t\t\treturn\n\t\t\t}\n\n\t\t\taliasWg := sync.WaitGroup{}\n\t\t\taliasErrs := concurrency.AllErrorRecorder{}\n\n\t\t\tfor _, alias := range aliases {\n\t\t\t\tif referenceAlias == alias {\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\t\t\t\taliasWg.Add(1)\n\t\t\t\tgo func(alias *topodatapb.TabletAlias) {\n\t\t\t\t\tdefer aliasWg.Done()\n\t\t\t\t\treplicaSchema, err := schematools.GetSchema(ctx, s.ts, s.tmc, alias, r)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\taliasErrs.RecordError(fmt.Errorf(\"GetSchema(%v, nil, %v, %v) failed: %v\", alias, req.ExcludeTables, req.IncludeViews, err))\n\t\t\t\t\t\treturn\n\t\t\t\t\t}\n\n\t\t\t\t\ttmutils.DiffSchema(topoproto.TabletAliasString(referenceAlias), referenceSchema, topoproto.TabletAliasString(alias), replicaSchema, &aliasErrs)\n\t\t\t\t}(alias)\n\t\t\t}\n\t\t\taliasWg.Wait()\n\n\t\t\tif aliasErrs.HasErrors() {\n\t\t\t\tfor _, err := range aliasErrs.Errors {\n\t\t\t\t\terrMessage := err.Error()\n\t\t\t\t\tresp.ResultsByShard[shard].Results = append(resp.ResultsByShard[shard].Results, errMessage)\n\t\t\t\t\tresp.Results = append(resp.Results, errMessage)\n\t\t\t\t}\n\t\t\t}\n\t\t}(shard)\n\t}\n","sourceCodeStart":5069,"sourceCodeEnd":5105,"githubUrl":"https://github.com/vitessio/vitess/blob/01a25a7d176f94613b8d59d799f438380a8760e4/go/vt/vtctl/grpcvtctldserver/server.go#L5069-L5105","documentation":"During ValidateSchema, schema is fetched from each replica tablet via schematools.GetSchema and compared to the reference (primary) schema. If GetSchema fails for a tablet, the error is recorded as \"GetSchema(%v, nil, %v, %v) failed: %v\" in the per-alias error recorder, so schema validation cannot complete for that tablet.","triggerScenarios":"ValidateSchema call where GetSchema on a tablet fails: tablet is down, tabletmanager RPC times out, or topodata for the alias is missing.","commonSituations":"Replica restarted mid-validation; network partition between vtctld and tablet; tablet's mysqld not running so schema cannot be read.","solutions":["Verify the failing tablet alias is up and healthy (vtctldclient GetTablet <alias>).","Fix tablet connectivity / restart vttablet, then re-run ValidateSchema.","If the tablet is decommissioned, remove its alias from the topology first."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"tab, err := ts.GetTablet(ctx, alias); if err != nil || tab.Type == topodatapb.TabletType_UNKNOWN { /* skip or repair tablet before schema validation */ }","typeGuard":null,"tryCatchPattern":"err := client.ValidateSchema(ctx, req); if err != nil { for _, e := range aliasErrs.Errors() { if strings.Contains(e.Error(), \"GetSchema(\") { alias := extractAlias(e); log.Warn(\"schema fetch failed\", slog.String(\"alias\", alias), slog.Any(\"error\", e)) } } }","preventionTips":["Verify tablet health before large validation runs","Remove decommissioned tablet aliases from the topo","Ensure vttablet's mysqld is up so schema queries succeed"],"tags":["schema","validation","tablet","rpc"],"backgroundTag":"tablet-schema-fetch-failed","analyzedSha":"01a25a7d176f94613b8d59d799f438380a8760e4","analyzedAt":"2026-09-01T17:28:30.605Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}