This section of the wiki is dedicated to explaining how Storm is implemented. You should have a good grasp of how to use Storm before reading these sections.

• Structure of the codebase
• Lifecycle of a topology
• Message passing implementation
• Acking framework implementation
• Metrics
• How transactional topologies work
  • subtopology for TransactionalSpout
  • how state is stored in ZK
  • subtleties around what to do when emitting batches out of order
• Unit testing
  • time simulation
  • complete-topology
  • tracker clusters