Apparatus, method and computer program for migrating an event detector process

Abstract

Embodiments relate to a concept for migrating an event detector of a first node (N) of a distributed computing system () to a second node (N) of the distributed computing system, wherein the event detector processes a plurality of input events (e; A, B, C) to generate at least one output event (D) based on the input events, wherein each of the input events has associated therewith an individual event delay corresponding to a propagation time of the input event to the first node (N). It comprises transferring (), from the first node (N) to the second node (N), information on event delays corresponding to the plurality of input events (e; A, B, C) at the first node (N); transferring () a content of the event detector from the first node (N) to the second node (N) to obtain a migrated event detector at the second node; forwarding () the plurality of input events (e; A, B, C) from the first node (N) to the second node (N); receiving (), at the second node (N), the plurality of input events (e; A, B, C) forwarded from the first node (N) and, in parallel, from originating event detectors associated to the plurality of input events; and processing (), at the second node (N), the plurality of received input events (e; A, B, C) based on the transferred information on the event delays and based on event delays of the plurality of input events (e; A, B, C) received from the associated originating event detectors.