Protobuf Practice

Edit the schema, wait for the descriptor checks, and continue when everything passes.

Progress

Exercise 5: Reserved Fields

5. Reserved Fields

Context

When a field is removed from a message, its number and name should not be reused. Reserving them prevents future schema edits from accidentally colliding with old serialized data.

Task

Reserve field number 3 and field name phone in UserAccount.

Advanced > Schema Evolution

schema.proto

Valid Schema

syntax = "proto3";

package practice;

message UserAccount {
  string id = 1;
  string email = 2;
  // The field 'phone' at number 3 was removed. Protect it!
}

EVALUATION_CHECKS

Field number 3 is reserved.

Field name 'phone' is reserved.

Exercise Incomplete

Please satisfy all checks above

Basics

Write practical schemas with messages, fields, and types.

Advanced

Evolve messages without breaking deployed systems.

Binary

Decode wire-format bytes one field at a time.