I would like to explain the issue in more detail. There are two issues;
1.DefaultServlet does not respect the outputBufferSize (32k) when using
NIO
When serving static files, Jetty tries to send the whole file in one
message to TCPIP. This causes a problem on HP NonStop as the maximum size can be
only 52K. Normal application responses are broken into 32K pieces.
By commenting out code where the buffer is writing through
GatheringByteChannel in public boolean flush(ByteBuffer... buffers)
method in org.eclipse.jetty.io.ChannelEndPoint.Java
class the defaultServlet also successfully served large files
properly.
@Override
public boolean
flush(ByteBuffer... buffers) throws IOException
{
int
flushed=0;
try
{
if
(buffers.length==1)
flushed=_channel.write(buffers[0]);
//else if
(buffers.length>1 && _channel instanceof GatheringByteChannel) //commented this line
// flushed=
(int)((GatheringByteChannel)_channel).write(buffers,0,buffers.length);
// and this
line
else
{
for
(ByteBuffer b : buffers)
{
if
(b.hasRemaining())
{
int
l=_channel.write(b);
if
(l>0)
flushed+=l;
if (b.hasRemaining())
break;
}
}
}
...
}
...
}
I do not know why the code the way it is. This never happened on Jetty using BIO. It shows up with NIO on Jetty 8 and
Jetty 9. This must be a bug; why should outbuffersize not be followed ?
2.Woff and Woff2 files are not being downloaded by defaultServlet (only on
the NonStop)
Before the above change, AwesomeFont woff, woof2 and ttf files could not
come down as they are larger than 52K.
After the above change all files of all sorts larger than 52K successfully
come, including awesomefont ttf file.
However, woff and woff2 files do not. For some reason, the browsers
disconnect the connection. Jetty sees a remote disconnect error.
Since the TTF file comes down, the application does not get impacted and
everything works. But there is something here that needs to be fixed.
The errno:4022 is the NonStop error when defaultServlet tries to do IO more than 52K, Nonstop manual explained the cause due to "The specified socket was already bound to an address or the address_len was incorrect"
The errno:4120 is the error when browser disconnects the connection during woff file download, cause due to "The peer process reset the connection before the operation completed"
Summary
We have a working setup in spite of the two issues after we made the code
change in
jetty.io. But I would like a proper fix.
Regards
Sakthi
