Troubleshooting the "DelimitedTextMoreColumnsThanDefined" Error in Data Factory Pipeline Copy

Correct Answer: B

If a folder you are copying consists of the files with different schemas, like different delimiters, quote char settings, variable number of columns, or some data issue, the Data Factory pipeline may return the following error:

Option A is incorrect.

When you reach the capacity limit of the integration runtime, you might be running a huge amount of data flow through the same integration runtime at the same time that makes the pipeline run get fail.

Option B is correct.

"DelimitedTextMoreColumnsThanDefined" error is generally returned when the folder you are copying has the files with different schemas.

Option C is incorrect.

Browser cache issue might result in a situation where you cancel a pipeline run, but pipeline monitoring often still demonstrates the progress status.

Option D is incorrect.

The option does not state the right cause for the given issue.

Reference:

The "DelimitedTextMoreColumnsThanDefined" error typically occurs when the number of columns in a delimited text file is greater than the number of columns defined in the schema of the dataset being used in the pipeline. This error message is specific to the Azure Data Factory service.

Therefore, the most likely cause of this error is option B - the folder you are copying has files with different schemas. If there are multiple delimited text files in the folder being copied, and these files have different numbers of columns or different column names, this can result in the error.

Option A - reaching the capacity limit of integration runtime - is an unlikely cause of this error, as it relates to the ability of the integration runtime to handle data processing and movement tasks, rather than the structure of the data being processed.

Option C - a browser cache issue - is also an unlikely cause of this error, as it pertains to the local storage of web data and settings, and is not directly related to the operation of the Azure Data Factory service.

Option D - invoking REST API in a Web activity - may cause a different type of error, such as an authentication or authorization error, but is not directly related to the "DelimitedTextMoreColumnsThanDefined" error.