Hello @Yoon, Sojin
How does the source data format looks like? any sample data?
To resolve this issue, you can try the following:
Check compression settings: Double-check the compression settings in your Mapping data flow to make sure that they are set correctly. Make sure that the compression type is set to gzip and that the filename pattern includes the '.gz' extension.
Check data format: Make sure that the data being written to ADLS Gen2 is in a format that can be compressed, such as JSON or CSV. If the data is not in the correct format, you may need to transform it before writing it to ADLS Gen2.
Check pipeline configuration: Make sure that the pipeline is configured correctly and that all settings are set correctly. Check the input and output datasets to make sure that they are configured correctly and that the compression settings are being applied correctly.