NIO - Invalid argument (errno:22)

Question

We have a mutlthreaded framework that spawns many individual threads with each merging extremely large files (1-3GB) to their own [thread] seperate files. We are using Java 1.4.2.10 and running on HP-UX.
The following is the bit of code that does our appending:
FileInputStream fileInputStream = new FileInputStream(fileName);
FileChannel in = fileInputStream.getChannel();
fileChannel.transferFrom(in, fileChannel.size(), in.size());
in.close();
fileInputStream.close();Now the grave issue that we have is that occasionaly we get the following "Invalid argument" error being thrown without any given specific reason. This error is not necessarily reproducable every time.
java.io.IOException: Invalid argument (errno:22)
        at sun.nio.ch.FileChannelImpl.map0(Native Method)
        at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:876)
        at sun.nio.ch.FileChannelImpl.transferFromFileChannel(FileChannelImpl.java:535)
        at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:598)Any insight on this error (being an existing bug, etc) would be most useful.

Answer 1

Can you expand on the reason why you have chosen to
transfer 1MB at a time? Won't this have a performance
impact when transfering a 100MB file (we loop through
it 100 times as opposed to once).Have a think about how long it takes to transfer a megabyte and how long it takes to execute two or three lines of loop bookkeeping code 100 times, and you will see that the 'overhead' is negligible. The loop will spend 99% of its time transferring and 1% looping. Probably the true ratio is even more extreme.
In any case you don't have a choice but to reduce the transfer chunk considerably. It's up to you to find the optimum for your hardware, O/S, files, disk drives, etc.
The other question that I am really interested to
know the answer for, is why is thsi error being
thrown?That's been explained above in replies #1 and #2. You agreed with it yourself in reply #3.
Why do you suggest changing the copy size out of all things?Err, because that's what causes the error? As in replies #1, #2, and #3?