How "File Reader" works?

Hi all,

How does the file reader node work?
When data is read from the file reader node, how is the data stored?
Are they temporarily saved when the workflow is executed and deleted when the workflow is closed?
I would like to know where the temporary directory is stored, etc.

I searched for this, but couldn’t find anything other than setting options. If you know anything please let me know.

@jjlee in general when a KNIME node has a green traffic light the underlying data will be stored with the workflow:

You could take a look at this thread:

Then you might want to take a look at the workbench guide our of KNIME’s excellent documentation:


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