Feature #63665
Updated by Leonid Usov 6 months ago
@QuiesceDb@ is an ephemeral versioned replicated database holding a collection of @QuiesceSet@ s. Each quiesce set carries a @QuiesceState@ which can be observed by clients. @QuiesceSet@ manages a collection of members - @QuiesceRoot@ s and their corresponding @QuiesceState@ s. When all members of a set reach quiesced state then the set is considered quiesced. @QuiesceDb@ is replicated across ranks of a file system. A single rank is selected to be the leader. The leader is authorized to maintain the database by processing external requests, peer acks, and timeout events. Updates to the database are sent out by the leader to all registered peers. @QuiesceDbManager@ is the class that maintains the quiesce db. Managers should be instantiated by the ranks and configured to form a cluster. The @QuiesceDbManager@ only cares about the consistency of the quiesce db, and relies on the @QuiesceAgent@ to perform the quiescing operations. <stub>