Abstract: Techniques for incremental stream switching in a distributed system with flip events are described. A special-purpose flip event is inserted into an event stream that indicates, to recipients of the stream, whether they are to switch to use of an alternate event stream. The flip event may identify which other event stream to use, how to obtain events of that event stream, when to switch to the other event stream, and/or whether that particular recipient is to switch. The recipients may be selectively or iteratively migrated using flip events targeting different recipients, limiting the blast radius of a switch. Via use of a tracking data structure, event replay and event skips can be avoided.

Abstract: The present disclosure relates to generating a passphrase for an encrypted volume by at least cryptographically combing the first cryptographic key and the shared secret. Where the shared secret is split into a plurality of shares and a first number of the plurality of shares is greater than a second number of the plurality of shares and the second number of the plurality of shares is required to reconstruct the shared secret.

Abstract: Systems, devices, and methods are provided for unblocking a computer resource usage count. A system may receive a request for a user account and a user account policy, and may obtain a count of a first number of user accounts, wherein the count is based on an aggregation of two or more actions associated with the user account policy. The system may determine, based on the count, that the first number of user accounts is less than a threshold number of accounts. The system may obtain based on the determination that the first number of user accounts is less than the threshold number of accounts, an event history. The system may determine, based on the event history, a second number of user accounts. The system may determine that the second number of user accounts is less than the threshold number of accounts, and may update the user account policy.

Abstract: A method and system for generating permissions policies and permission boundary policies are described. The system receives a first request from a central administrator to create a delegated administrator, the first request specifying with one or more access permissions. The system generates a permission boundary policy that specifies the one or more access permissions and a first permissions policy that grants permissions to the delegated administrator to at least one of create an IAM principal with the permission boundary policy or attach a second permissions policy to the IAM principal. An effective permission given to the IAM principal is an intersection of access permissions specified in the first permissions policy and the one or more access permissions in the permission boundary policy. The system attaches the first permissions policy and the permission boundary policy to the delegated administrator.

Abstract: Techniques for region management for distributed services in provider networks are described. A region management service (RMS) receives requests to enable or disable regions a provider network for users. The RMS identifies what services operate within the involved regions and transmits requests to configure resources within the regions that are specific to the users to the services. The RMS also receives messages indicating whether the transmitting services have successfully configured user resources pertaining to the services for the region.