Can someone please help me in understanding the impact of saving Hornetq/ActiveMQ Artemis messages to the file system and bypassing the queue every time?
The message is more than 2GB, and I run into Maximum size 2GB exceeded exception in HornetQ described here. So I was planning to not add the message to queue but write it manually to disk and pass the path of the file in header and read the message from the file. I really don't know the performance impact so asking if I do for all messages less than 2GB, will there be any performance impact?
Given the information you've provided I don't think anybody but you can determine the "performance impact" of manually writing the file to disk vs. sending the file to the broker.
Generally speaking, you will save the time required to send the file to the broker in the first place, but you don't indicate how fast the hard-drives are. If the hard-drive on the broker is much faster than the hard-drive on the client then it may take longer overall to write the file to disk manually.
Also, if the network is slow between the clients and the broker and fast between the clients and the shared drive where you're going to write the file then it may be overall faster to write the file to disk manually.
Ultimately it's going to be up to you to test the performance impact of your changes.