Question

I have one csv file, which is being written continuously by script. It writes timestamp and some other data per row. I have to read the latest data first.
Currently I am using RandomAccessFile in java to read the file in reverse way. But as its written continuously, I have to read the new data with priority. I am maintaining which timestamp has been sent and doing the work. It results unnecessary scanning operations.

Is there any better way to deal with this scenario?

Thanks in advance,

Answer 1

You could consider having one thread that reads new lines as they appear and pushes them onto a stack of unprocessed rows, and a second thread that pops the stack and processes the new rows in reverse order.

Depending on how long it takes to process a new row compared to how quickly they are generated, this might be sufficient. If new rows are generated faster than you can process them then this approach probably won’t work – the stack will get too big and you’ll run out of memory. In that case, depending on your requirements, you might be able to get away with a size-limited stack that discards old entries.