S4 0.5: piper release, focus on functionality and usability

S4 0.6: focus on application execution and performance

  • runtime isolation
  • metrics
  • I/O PEs
  • performance improvements
  • scalability
  • application upgrades: stateful upgrades, live stateless upgrades

S4 0.7: elasticity

  • integration with Helix

Other tasks / features

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