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of 31What are Protocol Buffers and why does gRPC use them?
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Protocol Buffers (protobuf) are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data. gRPC uses protobuf for several reasons:
- Efficiency: Binary serialization is faster and more compact than JSON/XML
- Type Safety: Strongly typed schema prevents runtime errors
- Code Generation: Automatically generates client and server code
- Language Agnostic: Works across different programming languages
- Schema Evolution: Supports backward and forward compatibility
Example protobuf definition:
syntax = "proto3";
message User {
int32 id = 1;
string name = 2;
string email = 3;
}
service UserService {
rpc GetUser(UserRequest) returns (User);
}
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How does gRPC differ from REST APIs?
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| Aspect | gRPC | REST |
|---|---|---|
| Protocol | HTTP/2 | HTTP/1.1 |
| Data Format | Protocol Buffers (binary) | JSON (text) |
| Performance | Faster, lower latency | Slower due to text parsing |
| Streaming | Bidirectional streaming | Limited streaming support |
| Browser Support | Limited (needs gRPC-Web) | Native support |
| Caching | Limited caching capabilities | HTTP caching support |
| Learning Curve | Steeper | Gentler |
| Use Case | Microservices, real-time apps | Web APIs, CRUD operations |
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What are the main advantages of using HTTP/2 in gRPC?
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HTTP/2 provides several advantages for gRPC:
- Multiplexing: Multiple requests can be sent simultaneously over a single connection
- Binary Protocol: More efficient parsing compared to HTTP/1.1 text protocol
- Header Compression: Reduces overhead using HPACK compression
- Server Push: Server can send multiple responses for a single request
- Flow Control: Prevents overwhelming slower receivers
- Connection Reuse: Reduces connection overhead and latency
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What types of service methods does gRPC support?
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gRPC supports four types of service methods:
- Unary RPC: Client sends one request, server returns one response
rpc GetUser(UserRequest) returns (User);
- Server Streaming RPC: Client sends one request, server returns a stream of responses
rpc ListUsers(ListUsersRequest) returns (stream User);
- Client Streaming RPC: Client sends a stream of requests, server returns one response
rpc CreateUsers(stream User) returns (CreateUsersResponse);
- Bidirectional Streaming RPC: Both client and server send streams of messages
rpc Chat(stream ChatMessage) returns (stream ChatMessage);
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How do you define a gRPC service in a .proto file?
What is code generation in gRPC and why is it important?
What is a gRPC client stub?
How do you handle errors in gRPC?
What is gRPC metadata and how is it used?
What are gRPC interceptors and what are they used for?
How do timeouts and deadlines work in gRPC?
What is connection pooling in gRPC and how does it work?
How do you implement authentication in gRPC?
What are the different load balancing strategies in gRPC?
How do you handle streaming in gRPC?
What is gRPC health checking and how do you implement it?
How do you optimize gRPC performance for high-throughput scenarios?
How do you implement custom load balancing in gRPC?
What is gRPC reflection and when would you use it?
How do you handle gRPC streaming backpressure?
How do you implement circuit breakers with gRPC?
How do you implement distributed tracing in gRPC?
What are the security best practices for gRPC in production?
How do you handle gRPC service discovery in a microservices architecture?
How do you implement graceful shutdown for gRPC servers?
How do you implement request validation in gRPC?
How do you debug and troubleshoot gRPC issues?
What is gRPC-Web and when would you use it?
How do you implement caching strategies with gRPC?
How do you handle versioning in gRPC services?
How do you implement comprehensive monitoring for gRPC services?
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