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When you run an elastic mapping to read data from a source with FileName field and write to a Microsoft Azure Data Lake Storage Gen2 target in JSON format, the mapping fails.
Workaround: Remove the FileName field from the imported source object and run the mapping. (March 2020)
When you read data from Microsoft Azure Data Lake Storage Gen2 and the file name has percentage (%) or hash (#) or when you write data to Microsoft Azure Data Lake Storage Gen2 and the file name has percentage (%), the data preview and mapping fails with the following error:
Cannot get data preview for the selected Connection and object. Please verify connection and object details.
Microsoft ticket reference number: 120123026002282