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_connect_unixsocket() (see below) does not use socktype value that was passed into SysLogHandler.__init__():
 def _connect_unixsocket(self, address):
 self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
 # syslog may require either DGRAM or STREAM sockets
 try:
 self.socket.connect(address)
 except socket.error:
 self.socket.close()
 self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
 self.socket.connect(address)

SOCK_DGRAM causes log messages larger than about 2000 bytes to be dropped altogether on MacOS X 10.7.5 and to be truncated to 2081 bytes on Linux (tested with Amazon's linux, which is based on centos). This is quite unfortunate, since many exception tracebacks for production apps are larger than 2000 bytes, and it's paramount to capture the entire traceback in order to debug the issue. This limitation can be overcome if _connect_unixsocket() used the socktype arg value that was passed to SysLogHandler constructor.

New changeset 6e31832f8275 by Vinay Sajip in branch '2.7':
Issue #16168: Use specified socket type for domain sockets in SysLogHandler.
http://hg.python.org/cpython/rev/6e31832f8275
New changeset f41e6ef3392a by Vinay Sajip in branch '3.2':
Issue #16168: Use specified socket type for domain sockets in SysLogHandler.
http://hg.python.org/cpython/rev/f41e6ef3392a
New changeset e4212f81d633 by Vinay Sajip in branch '3.3':
Issue #16168: Merged SysLogHandler update from 3.2.
http://hg.python.org/cpython/rev/e4212f81d633
New changeset d7d3e1a03fe0 by Vinay Sajip in branch 'default':
Closes #16168: Merged SysLogHandler update from 3.3.
http://hg.python.org/cpython/rev/d7d3e1a03fe0