Analytics Vasiliki (Vasia) Kalavri
 vkalavri@bu.edu Spring 2020 4/09: Flow control and load shedding ??? Vasiliki Kalavri | Boston University 2020 Keeping up with the producers • Producers can generate Vasiliki Kalavri | Boston University 2020 Load management approaches 3 ! Load shedder (a) Load shedding (b) Back-pressure (c) Elasticity Selectively drop records: • Temporarily trades-off result Kalavri | Boston University 2020 Load shedding • Load shedding is the process of discarding data when input rates increase beyond system capacity. • Load shedding techniques operate in a dynamic fashion:

State limited, in-memory partitioned, virtually unlimited, persisted to backends Load management shedding backpressure, elasticity Fault tolerance limited support, high availability full support, exactly-once