US Patent 10884787 Execution guarantees in an on-demand network code execution system

Systems and methods are described for implementing execution guarantees in an on-demand code execution system or other distributed code execution environment, such that the on-demand code execution system attempts to execute code only a desired number of times. The on-demand code execution system can utilize execution identifiers to distinguish between new and duplicative requests, and can decline to allocate computing resources for duplicative requests. The on-demand code execution system can further detect errors during execution, and rollback the execution to undo the execution's effects. The on-demand code execution system can then restart execution until the code has been execute the desired number of times.