Function Compute allows you to create event functions, web functions, and task functions to meet your business requirements in different scenarios. This topic describes the common scenarios and differences of different function creation methods in Function Compute.
Comparison
Item | Event function | Web function | Task function | |
Scenarios | Write programs to handle events based on the interfaces defined in Function Compute. | Write programs based on popular frameworks, such as Java Spring Boot, Node.js Express, Python Flask, and Golang Gin, or migrate applications deployed on existing frameworks. | Container images
| Invoke a function in asynchronous invocation mode and track and save the status of each phase of the asynchronous invocation. By default, the task mode is enabled for task functions. You can use the task mode to submit, view, stop, and retry asynchronous tasks. |
Cold start duration | Shortest. The durations of cold starts are the shortest because runtimes are not included in code packages. | Short. Web functions use public images and have no image pull time, which accelerates cold starts. | Long. The durations of cold starts are relatively longer because image pulling takes time. | Shortest. The durations of cold starts are also the shortest because runtimes are not included in code packages. |
Upper limit of code package size | 500 MB compressed code package. | 500 MB compressed code package. | 10 GB compressed image. | 500 MB compressed code package. |
Code package formats | ZIP, JAR (Java), and folder. | ZIP, JAR (Java), and folder. | ZIP, JAR (Java), and folder. | |
GPU-accelerated instances | Not supported. | Not supported. | Supported. | Not supported. |
Runtimes | Node.js, Python, PHP, Java, .NET Core, and Go. | Unlimited. | Unlimited. | Node.js, Python, PHP, Java, .NET Core, and Go. |
Function types
Event functions
If you want to write programs to handle events based on the interfaces defined in Function Compute, create an event function. For more information, see Create an event function.
Web functions
If you want to write programs based on popular frameworks, such as Java Spring Boot, Node.js Express, Python Flask, and Golang Gin, create functions based on custom container images, or migrate existing framework-based applications, create a web function. For more information, see Create a web function.
Task functions
If you want to invoke your function in asynchronous mode and need to track and save the status of each phase of asynchronous invocations, you can create a task function. By default, the task mode is enabled for task functions. You can use the task mode to submit, view, stop, and retry asynchronous tasks. For more information, see Create a task function.
