Abstract: The online concierge system generates task units based on orders and assigns batches of task units to pickers. The online concierge system generates task units based on received orders. The online concierge system generates permutations of these task units to generate candidate sets of task batches. The online concierge system scores each of these candidate sets, and selects a set of task batches to assign to pickers based on the scores. Additionally, to determine which task UI to display to the picker, the picker client device uses a UI state machine. The UI state machine is a state machine where each state corresponds to a task UI to display on the picker client device. The state transitions between the UI states of the UI state machine indicate which UI state to transition to from a current UI state based on the next task unit in the received task batch.

Abstract: Particular embodiments allow a content delivery service to dynamically adjust how the service allocates content delivery traffic to multiple content delivery networks (CDNs). In one embodiment, the content delivery service may service enough requests for media programs that multiple CDNs are used. This allows the content delivery service to allocate traffic to different CDNs. Instead of solely relying on the CDN to provide quality of service solutions, the content delivery service may configure client devices to send information to it that allows the content delivery service to analyze the media program playback quality of service. Then, the content delivery service can adjust the allocation for the CDNs if a problem is detected at a specific CDN.

Abstract: Particular embodiments allow a content delivery service to dynamically adjust how the service allocates content delivery traffic to multiple content delivery networks (CDNs). In one embodiment, the content delivery service may service enough requests for media programs that multiple CDNs are used. This allows the content delivery service to allocate traffic to different CDNs. Instead of solely relying on the CDN to provide quality of service solutions, the content delivery service may configure client devices to send information to it that allows the content delivery service to analyze the media program playback quality of service. Then, the content delivery service can adjust the allocation for the CDNs if a problem is detected at a specific CDN.