Result files are created when tasks are running. Flink enables you to configure parameters for file creation.

Configuration items include overwriting policy and directory creation.

**Table 1** Parameter description
Parameter	Description	Default Value	Mandatory
fs.overwrite-files	Whether to overwrite the existing file by default when the file is written.	false	No
fs.output.always-create-directory	When the degree of parallelism (DOP) of file writing programs is greater than 1, a directory is created under the output file path and different result files (one for each parallel writing program) are stored in the directory. If this parameter is set to true, a directory is created for the writing program whose DOP is 1 and a result file is stored in the directory. If this parameter is set to false, the file of the writing program whose DOP is 1 is created directly in the output path and no directory is created.	false	No

File Systems