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  • Provide ability to change arg, result classes in compatible way.
    • Possible approach is to reuse communication serdes framework.
    • Other possibility is to migrate on BinaryObject as a arguments and results.
  • PR checks for Messages  ancestor change with the some warning, labels, etc. that can draw reviewer attention to the possible compatibility issues.

Phase 6 - Testing

  • ducktests to check upgrade procedure.
  • (question) unit tests mode that start some nodes of previous version. 

Phase 7 - Development process changes

  • (question) Any change in public API MUST be in the form of IEP.
  • (question) Any change in public API MUST be voted by two(three?) committers.

Alternative designs

  • subsystem API versions (like in REST API)
  • runtime component(IgniteProcessor, IgniteManager) upgrade with the dynamic class loading. 

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