Is it necessary to transfer or remove all flow files before session.commit method?

[#1]

Hello,

I am going to create a custom processor in which I will have to explicitly call session.commit() method in a loop in which I transfer a file data but I dont want to transfer or remove my global FlowFile's object that I get in first line of onTrigger from session, I want to use that global flow file object again in my loop, But I also have to use session.commit() in loop.

Please let me know what is the exact use of session.commit(), and what if I wont use session.commit() method.