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Orleans Design Patterns

  • Observer Allows an observer to be notified of any state changes that a grain can choose to publish.
  • Cadence Decouple the rhythm of grain interactions from external input using timers.
  • Reduce Provides a hierarchical structure to aggregate a value stored in many grains, which would unachievable with a fan-out.
  • Smart Cache A performance optimization which uses Orleans as a distributed caching system in front of a storage system. Allows reads to be served from memory, and writes to be optionally buffered.
  • Dispatcher A technique to send a batch of messages into Orleans in a single call, and have them distributed internally to the correct grains.
  • Hub Provides clients with a single well-known publishing endpoint by channeling events from multiple event sources, dramatically simplifying registration and management of transient subscriptions.

Approximate Performance Expectations

Using X-Large VMs (8 CPU Cores / 14 GB RAM) on Microsoft Azure, with one silo per VM:

  • A grain will handle a maximum of 1,000 requests per second.
  • A silo will handle a maximum of 10,000 requests per second.
  • A silo will hold 100,000 active grains.

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📐 Design patterns for Project Orleans

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