GraphQL Federation & Microservices

# Graphql Federation

This document provides comprehensive guidelines for graphql federation development and best practices.

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## Federation Fundamentals

1. **Federated**
   - Federated schema composition
   - Implement proper federated schema composition
   - Follow best practices for optimal results

2. **Subgraph**
   - Subgraph and supergraph concepts
   - Implement proper subgraph and supergraph concepts
   - Follow best practices for optimal results

3. **Gateway**
   - Gateway and subservice architecture
   - Implement proper gateway and subservice architecture
   - Follow best practices for optimal results

4. **Entity**
   - Entity references and extensions
   - Implement proper entity references and extensions
   - Follow best practices for optimal results

5. **Federation**
   - Federation directives usage
   - Implement proper federation directives usage
   - Follow best practices for optimal results

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## Schema Design

6. **Entity**
   - Entity definition with @key directive
   - Implement proper entity definition with @key directive
   - Follow best practices for optimal results

7. **Schema**
   - Schema extension with @extends
   - Implement proper schema extension with @extends
   - Follow best practices for optimal results

8. **External**
   - External field references with @external
   - Implement proper external field references with @external
   - Follow best practices for optimal results

9. **Field**
   - Field resolution with @requires
   - Implement proper field resolution with @requires
   - Follow best practices for optimal results

10. **Computed**
   - Computed fields with @provides
   - Implement proper computed fields with @provides
   - Follow best practices for optimal results

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## Gateway Configuration

11. **Apollo**
   - Apollo Gateway setup and configuration
   - Implement proper apollo gateway setup and configuration
   - Follow best practices for optimal results

12. **Schema**
   - Schema composition and validation
   - Implement proper schema composition and validation
   - Follow best practices for optimal results

13. **Service**
   - Service discovery and health checks
   - Implement proper service discovery and health checks
   - Follow best practices for optimal results

14. **Query**
   - Query planning and execution
   - Implement proper query planning and execution
   - Follow best practices for optimal results

15. **Error**
   - Error handling and fallbacks
   - Implement proper error handling and fallbacks
   - Follow best practices for optimal results

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## Subgraph Development

16. **Building**
   - Building federation-compliant subgraphs
   - Implement proper building federation-compliant subgraphs
   - Follow best practices for optimal results

17. **Entity**
   - Entity resolver implementation
   - Implement proper entity resolver implementation
   - Follow best practices for optimal results

18. **Reference**
   - Reference resolver patterns
   - Implement proper reference resolver patterns
   - Follow best practices for optimal results

19. **Schema**
   - Schema SDL composition
   - Implement proper schema sdl composition
   - Follow best practices for optimal results

20. **Subgraph**
   - Subgraph testing strategies
   - Implement proper subgraph testing strategies
   - Follow best practices for optimal results

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## Type System Extensions

21. **Extending**
   - Extending types across services
   - Implement proper extending types across services
   - Follow best practices for optimal results

22. **Shared**
   - Shared type definitions
   - Implement proper shared type definitions
   - Follow best practices for optimal results

23. **Interface**
   - Interface and union federation
   - Implement proper interface and union federation
   - Follow best practices for optimal results

24. **Custom**
   - Custom scalar federation
   - Implement proper custom scalar federation
   - Follow best practices for optimal results

25. **Enum**
   - Enum sharing strategies
   - Implement proper enum sharing strategies
   - Follow best practices for optimal results

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## Query Planning

26. **Distributed**
   - Distributed query execution
   - Implement proper distributed query execution
   - Follow best practices for optimal results

27. **Query**
   - Query planning optimization
   - Implement proper query planning optimization
   - Follow best practices for optimal results

28. **Entity**
   - Entity resolution strategies
   - Implement proper entity resolution strategies
   - Follow best practices for optimal results

29. **N+1**
   - N+1 query prevention
   - Implement proper n+1 query prevention
   - Follow best practices for optimal results

30. **Caching**
   - Caching across services
   - Implement proper caching across services
   - Follow best practices for optimal results

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## Security & Authorization

31. **Federated**
   - Federated authentication patterns
   - Implement proper federated authentication patterns
   - Follow best practices for optimal results

32. **Context**
   - Context propagation across services
   - Implement proper context propagation across services
   - Follow best practices for optimal results

33. **Authorization**
   - Authorization in distributed schemas
   - Implement proper authorization in distributed schemas
   - Follow best practices for optimal results

34. **Rate**
   - Rate limiting at gateway level
   - Implement proper rate limiting at gateway level
   - Follow best practices for optimal results

35. **Schema**
   - Schema access control
   - Implement proper schema access control
   - Follow best practices for optimal results

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## Performance Optimization

36. **Query**
   - Query batching and caching
   - Implement proper query batching and caching
   - Follow best practices for optimal results

37. **Entity**
   - Entity caching strategies
   - Implement proper entity caching strategies
   - Follow best practices for optimal results

38. **Dataloader**
   - Dataloader patterns in federation
   - Implement proper dataloader patterns in federation
   - Follow best practices for optimal results

39. **Schema**
   - Schema stitching alternatives
   - Implement proper schema stitching alternatives
   - Follow best practices for optimal results

40. **Performance**
   - Performance monitoring
   - Implement proper performance monitoring
   - Follow best practices for optimal results

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## Development Workflow

41. **Schema**
   - Schema composition validation
   - Implement proper schema composition validation
   - Follow best practices for optimal results

42. **Local**
   - Local development setup
   - Implement proper local development setup
   - Follow best practices for optimal results

43. **Integration**
   - Integration testing strategies
   - Implement proper integration testing strategies
   - Follow best practices for optimal results

44. **Schema**
   - Schema evolution management
   - Implement proper schema evolution management
   - Follow best practices for optimal results

45. **Version**
   - Version compatibility
   - Implement proper version compatibility
   - Follow best practices for optimal results

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## Monitoring & Observability

46. **Distributed**
   - Distributed tracing setup
   - Implement proper distributed tracing setup
   - Follow best practices for optimal results

47. **Metrics**
   - Metrics collection across services
   - Implement proper metrics collection across services
   - Follow best practices for optimal results

48. **Error**
   - Error aggregation and reporting
   - Implement proper error aggregation and reporting
   - Follow best practices for optimal results

49. **Performance**
   - Performance monitoring
   - Implement proper performance monitoring
   - Follow best practices for optimal results

50. **Schema**
   - Schema usage analytics
   - Implement proper schema usage analytics
   - Follow best practices for optimal results

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## Advanced Patterns

51. **Federation**
   - Federation with subscriptions
   - Implement proper federation with subscriptions
   - Follow best practices for optimal results

52. **File**
   - File upload handling
   - Implement proper file upload handling
   - Follow best practices for optimal results

53. **Custom**
   - Custom directives federation
   - Implement proper custom directives federation
   - Follow best practices for optimal results

54. **Schema**
   - Schema transformation
   - Implement proper schema transformation
   - Follow best practices for optimal results

55. **Legacy**
   - Legacy system integration
   - Implement proper legacy system integration
   - Follow best practices for optimal results

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## Deployment Strategies

56. **Blue-green**
   - Blue-green deployment for schemas
   - Implement proper blue-green deployment for schemas
   - Follow best practices for optimal results

57. **Rolling**
   - Rolling schema updates
   - Implement proper rolling schema updates
   - Follow best practices for optimal results

58. **Backwards**
   - Backwards compatibility
   - Implement proper backwards compatibility
   - Follow best practices for optimal results

59. **Gateway**
   - Gateway high availability
   - Implement proper gateway high availability
   - Follow best practices for optimal results

60. **Service**
   - Service mesh integration
   - Implement proper service mesh integration
   - Follow best practices for optimal results

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## Troubleshooting

61. **Schema**
   - Schema composition errors
   - Implement proper schema composition errors
   - Follow best practices for optimal results

62. **Query**
   - Query planning issues
   - Implement proper query planning issues
   - Follow best practices for optimal results

63. **Entity**
   - Entity resolution problems
   - Implement proper entity resolution problems
   - Follow best practices for optimal results

64. **Performance**
   - Performance bottlenecks
   - Implement proper performance bottlenecks
   - Follow best practices for optimal results

65. **Network**
   - Network connectivity issues
   - Implement proper network connectivity issues
   - Follow best practices for optimal results

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## Best Practices

66. **Schema**
   - Schema design principles
   - Implement proper schema design principles
   - Follow best practices for optimal results

67. **Service**
   - Service boundary definition
   - Implement proper service boundary definition
   - Follow best practices for optimal results

68. **Error**
   - Error handling strategies
   - Implement proper error handling strategies
   - Follow best practices for optimal results

69. **Documentation**
   - Documentation standards
   - Implement proper documentation standards
   - Follow best practices for optimal results

70. **Team**
   - Team collaboration patterns
   - Implement proper team collaboration patterns
   - Follow best practices for optimal results

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## Migration Strategies

71. **Monolith**
   - Monolith to federation migration
   - Implement proper monolith to federation migration
   - Follow best practices for optimal results

72. **Schema**
   - Schema stitching to federation
   - Implement proper schema stitching to federation
   - Follow best practices for optimal results

73. **Incremental**
   - Incremental adoption patterns
   - Implement proper incremental adoption patterns
   - Follow best practices for optimal results

74. **Risk**
   - Risk mitigation strategies
   - Implement proper risk mitigation strategies
   - Follow best practices for optimal results

75. **Rollback**
   - Rollback procedures
   - Implement proper rollback procedures
   - Follow best practices for optimal results

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## Tooling & Ecosystem

76. **Apollo**
   - Apollo Studio integration
   - Implement proper apollo studio integration
   - Follow best practices for optimal results

77. **Schema**
   - Schema registry management
   - Implement proper schema registry management
   - Follow best practices for optimal results

78. **CLI**
   - CLI tools and automation
   - Implement proper cli tools and automation
   - Follow best practices for optimal results

79. **CI/CD**
   - CI/CD integration
   - Implement proper ci/cd integration
   - Follow best practices for optimal results

80. **Third-party**
   - Third-party tool compatibility
   - Implement proper third-party tool compatibility
   - Follow best practices for optimal results

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## Summary Checklist

- [ ] Core principles implemented
- [ ] Best practices followed
- [ ] Performance optimized
- [ ] Security measures in place
- [ ] Testing strategy implemented
- [ ] Documentation completed
- [ ] Monitoring configured
- [ ] Production deployment ready

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Follow these comprehensive guidelines for successful graphql federation implementation.