Abstract: A technology is provided for fault invocation in computing service environment. A service request that is directed to a virtualized service may be received from a calling process. The service request may be received at a fault injection service located in a service provider environment. A determination may be made whether to fail the service request using a random failure mode that randomly fails the service request. The service request may be blocked when the service request has been selected to fail, and the service request may be blocked when the service request has been selected to be failed by the random failure mode, and the results of the service request may be reported.

Abstract: A master node may be configured with helper nodes in a one-to-many structure in a multicast tree for data streaming. A master node may receive network requests from the helper nodes in order to construct a pingback response. A master node may establish a network latency, for each of the helper nodes according to the pingback responses, to form a broadcast timing index. A master node may create routing tables from the broadcast timing index for local multicast routing at helper nodes within the multicast tree. A master node may send the routing tables from the master node to each of the helper nodes to arrange helper nodes in proximity to one another and create helper tiers within the multi-cast tree. A master node may stream data from the master node to the helper nodes according to a center-to-edge order of the multicast tree based on the routing table.

Abstract: A technology is provided for mediated fault invocation in computing service environment. A service request that is directed to a virtualized service may be received from a calling process. The service request may be received at a user-controlled fault injection service and the virtualized service is located in a service provider environment. A determination may be made whether to modify or fail the service request as received by the user-controlled fault injection service. The service request may be blocked when the service request has been selected to fail. The service request may be sent to a virtualized service in a service provider environment or an emulated service controlled by the user-controlled fault injection service when the service request has been modified. The results of the service request may be reported to the calling process as received via the user-controlled fault injection service.