A 911-support portal’s recovery-time objective requires the back-end to resume serving within seconds of a worker failure, and sessions are already shared or stateless. Which HA pattern best matches that requirement?
Select an answer to reveal the explanation.
Short Explanation
Two open service windows recover faster than a closed spare you unlock after the line already formed. Active-active fits a tight recovery-time need when sessions are shared or stateless. A cold standby or a tarball is slower by design.
Full Explanation
Active-active back-ends both serve and recover faster than a cold spare started after the primary dies, but they require the shared-or-stateless session design from distributed-app basics. Match the HA pattern to the recovery-time requirement: active-standby or “we have a backup tarball” may be cheaper but slower. This is pattern selection, not a cloud-vendor HA SKU list.