Master - Worker

Master - Worker is a design pattern that Terracotta users leverage to divide and route large workloads around a grid of JVMs.

To Deliver Master - Worker Terracotta uses both POJOs and frameworks hosted on our own project Forge.

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Simple

Queue-based - POJO LinkedBlockingQueue option

• Stateful workflows with no outside persitence
• LinkedBlockingQueue.peek(), .take(), .put() to work with the queues

Higher order abstractions when needed

• Event-based callback and listeners
• One-way, two-way communication channels
• Automatic job failure and requeing

Fast

• Locality of Reference
• Striped locks
• Striped queues

Control the granularity

• Messaging patterns move whole objects
• Coordination patterns shared objects and only signal object workflow

Reliable

Read & write from System of Record Data

• Read data from databases or message queues
• Stripe or distribute blocking database updates for scale
  
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Garuanteed delivery

• No work messages get lost
• Guaranteed in-order delivery
• Once-and-only once