Hi Oliver, it's entirely possible, especially if couchapp is using
_bulk_docs for the upload (I don't know if that's the case). Best,
Adam
On Nov 6, 2009, at 5:35 AM, Oliver Oli wrote:
sometimes i'm getting connection errors from couchapp over a slow DSL
connection. is this related?
On Wed, Nov 4, 2009 at 10:42 PM, Adam Kocoloski
<[email protected]> wrote:
Hi, Zachary Zolton, Joe Williams and I stumbled on an awkward part of
CouchDB's (actually MochiWeb's) configuration that makes working
over a slow
connection problematic. When receiving a large unchunked upload,
MochiWeb
calls
gen_tcp:recv(Socket, Length = 1048576, Timeout = 10000)
which says "pull 1MB off the socket in 10 seconds, or timeout".
This is a
bit crazy, as we'd definitely like to support e.g. replication with
CouchDB
servers over slower links than 100KB/s.
I tried to do a little digging to see what recourse we have. We
can of
course play the tuning game adjusting the length and timeout until
we're
happy, but I think it'd be nicer to never timeout a connection that
is still
sending data. From the gen_tcp man page
The Length argument is only meaningful when the socket is in raw
mode and denotes the number of bytes to read. If Length = 0, all
available bytes are returned. If Length > 0, exactly Length
bytes are returned, or an error; possibly discarding less than
Length bytes of data when the socket gets closed from the other
side.
The optional Timeout parameter specifies a timeout in millisec-
onds. The default value is infinity.
I don't know what the behavior is when there are 0 bytes available
on the
socket -- does gen_tcp:recv just keep returning 0 and leave it to
us to
implement the timeout, or can we do something like
gen_tcp:recv(Socket, 0, 10000)
Best, Adam
