Vasiliki (Vasia) Kalavri
 vkalavri@bu.edu Spring 2020 4/02: Elasticity policies and state migration ??? Vasiliki Kalavri | Boston University 2020 Streaming applications are long-running • Workload requires state migration with correctness guarantees. ??? Vasiliki Kalavri | Boston University 2020 State migration 29 ??? Vasiliki Kalavri | Boston University 2020 State migration strategies • Stop-and-restart during migration if the state is large • Progressive • move state to be migrated in smaller pieces, e.g. key-by-key • can be used to interleave state transfer with processing • migration duration

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