{"record":{"id":"49c10722cbdeaea9","repo":"t8y2/dbx","slug":"hiveserver2-table-comment-metadata-failed-v-ta-49c107","errorCode":null,"errorMessage":"HiveServer2 table comment metadata failed (%v); table listing fallback failed: %w","messagePattern":"HiveServer2 table comment metadata failed \\((.+?)\\); table listing fallback failed: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"agents/drivers/hive-go/metadata.go","lineNumber":671,"sourceCode":"\t\t\tIsNullable: true,\n\t\t\tComment:    comment,\n\t\t})\n\t}\n\treturn values, nil\n}\n\nfunc (server *server) getTableComment(schema, table string) (*string, error) {\n\tif strings.TrimSpace(table) == \"\" {\n\t\treturn nil, errors.New(\"table is required\")\n\t}\n\tschema = firstNonEmpty(schema, server.config.Database)\n\tmetadataResult, err := server.hiveMetadata(func(ctx context.Context, provider gohive.MetadataProvider) (gohive.MetadataResult, error) {\n\t\treturn provider.GetHiveTables(ctx, schema, table, nil)\n\t})\n\tif err != nil {\n\t\ttables, listErr := server.listTables(schema, metadataListConstraints{Filter: table})\n\t\tif listErr != nil {\n\t\t\treturn nil, fmt.Errorf(\"HiveServer2 table comment metadata failed (%v); table listing fallback failed: %w\", err, listErr)\n\t\t}\n\t\tfor _, candidate := range tables {\n\t\t\tif strings.EqualFold(candidate.Name, table) {\n\t\t\t\treturn candidate.Comment, nil\n\t\t\t}\n\t\t}\n\t\treturn nil, nil\n\t}\n\trows := newHiveMetadataRows(metadataResult)\n\tfor _, row := range rows.rows {\n\t\tif strings.EqualFold(metadataString(rows.value(row, \"TABLE_NAME\")), table) {\n\t\t\treturn optionalString(metadataString(rows.value(row, \"REMARKS\", \"COMMENT\"))), nil\n\t\t}\n\t}\n\treturn nil, nil\n}\n\nfunc (server *server) listDataTypes() ([]string, error) {","sourceCodeStart":653,"sourceCodeEnd":689,"githubUrl":"https://github.com/t8y2/dbx/blob/c0390bff16418b651f4728520d99adf8ce48829a/agents/drivers/hive-go/metadata.go#L653-L689","documentation":"getTableComment fetches a table's comment via HiveServer2 metadata (GetHiveTables filtered by name). If that fails it falls back to a full listTables call and matches the table by name. This error is raised only when both the metadata call and the table-listing fallback fail, embedding the metadata error and wrapping the fallback error.","triggerScenarios":"get_table_comment RPC where the metadata API fails (permissions/transport) and the subsequent listTables fallback (which itself may hit the SHOW TABLES path) also fails — typically permission or connectivity issues on the schema.","commonSituations":"Service account lacking read access to the schema catalog; broken connection causing both attempts to fail; restricted HiveServer2 deployments where metadata calls are disabled.","solutions":["Address the root metadata error shown first (permissions or connectivity)","Ensure the user can run SHOW TABLES / metadata listing on the target schema","Reconnect if both failures are transport-related (connection dropped)","If comments are optional, treat the failure as non-fatal and degrade to no comment"],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":"comment, err := server.getTableComment(schema, table)\nif err != nil && strings.Contains(err.Error(), \"table listing fallback failed\") {\n    log.Printf(\"comment unavailable for %s.%s: %v\", schema, table, err)\n    return nil, nil // degrade gracefully\n}","preventionTips":["Grant catalog/metadata read privileges to the connect user","Check connectivity before bulk comment retrieval","Tolerate missing comments since absent tables return nil, nil"],"tags":["hive","metadata","fallback","permissions"],"backgroundTag":"metadata-query-failed","analyzedSha":"c0390bff16418b651f4728520d99adf8ce48829a","analyzedAt":"2026-09-05T23:05:10.900Z","contentChangedAt":"2026-09-05T23:05:10.900Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}