3646619 - Empty folders are created in ETL_TMP_DIR location when using the On-Premise Extractor

When executing extractions using the On-Premise Extractor, empty folders like 'cdata1234567890123456789' are created in the ETL_TMP_DIR location (by default, the etltmp directory). These are not removed automatically.

A new folder is created every time a connection to the source system is initialised.
This means that during extraction, one folder is created for the first connection test and then one more folder is created for each table being extracted. 
A new folder is also created when simply pressing the 'Test Connection' button in the Connection setup. 

These folders are empty and can be safely deleted manually when the On-premise Extractor is idle.

Or

On-Premise Extractor version v1.1374.0 and above supports the clean-up of tmp folder on extractor start up. The feature is disabled by default. Depending on the operating system used, it can be enabled by:

For Linux - modify the start.sh file and add the line:

export TMP_DIR_CLEANUP_ENABLED=true 

For Windows - modify the start.bat file and add the line:

set TMP_DIR_CLEANUP_ENABLED=true 

Once done, the temporary folders will be deleted each time the on-prem extractor is started.

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