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Function as a Service (FaaS) is a new cloud technology with automatedresource management. Different from traditional cloud computing, each FaaScloud function can only run a fixed period of time before being decommissioned.Furthermore, FaaS cloud providers often update their platforms (e.g., idletimeout). These changes and their associated impact are not transparent andcould potentially impact the execution of the cloud functions. Hence, in thispaper, we develop a methodology to characterize the cloud function idle timeoutwhich is the duration a FaaS cloud provider keeps a cloud function instancealive without serving active traffic. Our study was conducted on three popularFaaS platforms, namely AWS Lambda, IBM and Azure Cloud Function. Moreover, wealso report how long a cloud function instance can be kept alive when a userregularly polls the instance. Experimental results show that the idle timeoutperiod has evolved from 01/2020 till 01/2022.

Has Your FaaS Application Been Decommissioned Yet? -- A Case Study on the Idle Timeout in Function as a Service Infrastructure