US Patent 9887889 State reconciliation using event tracking and polling

Methods and apparatus for state reconciliation using event tracking and polling are disclosed. Occurrences of events that may result in a state change of an entity of a provider network are monitored. An indication of an expected state of the entity is transmitted to a reconciler. The reconciler determines whether a discrepancy exists between the expected state and a detected state, obtained using a polling mechanism, of the entity. In response to determining that a discrepancy exists, one or more actions are initiated.