item = self.bucket.get(ext_key)
  File "/usr/local/lib/python2.7/dist-packages/riak/bucket.py", line 206, in get
    return obj.reload(r=r, pr=pr, timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/riak/riak_object.py", line 307, in reload
    self.client.get(self, r=r, pr=pr, timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 127, in wrapper
    self.client.get(self, r=r, pr=pr, timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 127, in wrapper
    return self._with_retries(pool, thunk)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 69, in _with_retries
    return fn(transport)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 125, in thunk
    return self._with_retries(pool, thunk)
    return fn(self, transport, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/operations.py", line 315, in get
    return fn(transport)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/transport.py", line 125, in thunk
    return fn(self, transport, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/riak/client/operations.py", line 315, in get
    return transport.get(robj, r=r, pr=pr, timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/transport.py", line 146, in get
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/transport.py", line 146, in get
    MSG_CODE_GET_RESP)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 43, in _request
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 43, in _request
    return self._recv_msg(expect)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 59, in _recv_msg
    raise Exception("unknown msg code %s" % msg_code)
  File "/usr/local/lib/python2.7/dist-packages/riak/transports/pbc/connection.py", line 110, in _parse_msg
Exception: unknown msg code 56
    pbo.ParseFromString(packet)
  File "/usr/lib/pymodules/python2.7/google/protobuf/message.py", line 179, in ParseFromString
    self.MergeFromString(serialized)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/python_message.py", line 755, in MergeFromString
    if self._InternalParse(serialized, 0, length) != length:
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/python_message.py", line 782, in InternalParse
    pos = field_decoder(buffer, new_pos, end, self, field_dict)
  File "/usr/lib/pymodules/python2.7/google/protobuf/internal/decoder.py", line 446, in DecodeField
    raise _DecodeError('Truncated string.')
DecodeError: Truncated string.