1. A method, comprising: receiving, by a processing device of a command dispatching module associated with a first event processing node, an event processing command comprising a command identifier; determining, by the processing device, that the event processing command has not yet been executed by attempting to store the command identifier in a hash table employed for storing identifiers of executed commands, wherein the hash table is to reject duplicate command identifiers; and responsive to successfully storing the command identifier in the hash table, causing the event processing command to be executed.