You cannot directly decide at the source level whether to read the file or not depending on the size of file.
I suggest you to use a command task (create a script to find the file size), only if that command task returns true (for file size larger than 1KB) then you can run the next Mapping task. Use the command task as decision maker for triggering the mapping task.
This is one workaround I can think of. Let me know if that helps.
I am using IICS current version and I do not see command task in Mapping.
How would it be achieved?
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Command task needs to be used in a Taskflow and make the decision of subsequent task execution.
Use the below document on more details on Command task: