How to use the command 'odps func' (with examples)

The ‘odps func’ command is used to manage functions in ODPS (Open Data Processing Service). It allows users to create, list, and delete functions in their current project. This command is particularly useful for developers working with ODPS who need to manage and control functions used in their data processing operations.

Use case 1: Show functions in the current project

Code:

odps func list functions;

Motivation: This use case allows users to view a list of functions that have been created in the current project. It can be useful for developers who need to check which functions are currently available for use.

Explanation:

• list functions is the command to retrieve the list of functions in the current project.

Example output:

Function Name    |    Resource Type    |    Resource Location
----------------------------------------------------------------
func1            |    JAR              |    package.jar
func2            |    Python Script    |    script.py        

Use case 2: Create a Java function using a .jar resource

Code:

odps func create function func_name as path.to.package.Func using 'package.jar';

Motivation: This use case allows users to create a Java function in ODPS using a .jar resource file. Java functions can be used for complex data processing operations or custom transformations in ODPS.

Explanation:

• create function is the command to create a new function.
• func_name is the name of the function you want to create.
• path.to.package.Func is the fully qualified class name of the Java function.
• 'package.jar' is the path to the JAR file containing the Java function code.

Example output:

Function 'func_name' created successfully.

Use case 3: Create a Python function using a .py resource

Code:

odps func create function func_name as script.Func using 'script.py';

Motivation: This use case allows users to create a Python function in ODPS using a .py script. Python functions can be used for simpler data processing operations or custom transformations in ODPS.

Explanation:

• create function is the command to create a new function.
• func_name is the name of the function you want to create.
• script.Func is the name of the Python function defined in the script.
• 'script.py' is the path to the Python script file containing the function definition.

Example output:

Function 'func_name' created successfully.

Use case 4: Delete a function

Code:

odps func drop function func_name;

Motivation: This use case allows users to delete a function from ODPS. It can be useful when a function is no longer needed or if there are duplicate or incorrect functions in the project.

Explanation:

• drop function is the command to delete a function.
• func_name is the name of the function you want to delete.

Example output:

Function 'func_name' deleted successfully.

Conclusion:

The ‘odps func’ command provides a convenient way to manage functions in ODPS. Users can list existing functions, create new functions using Java or Python resources, and delete unnecessary functions. By utilizing this command, developers can easily organize and control the functions used in their ODPS projects.