[Buildbot] #3567: buildbot nine master trigger traceback in old 'slave'

[Buildbot trac]

#3567: buildbot nine master trigger traceback in old 'slave'
------------------------+-------------------
Reporter:  tardyp       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  0.9.0
 Version:  master       |   Keywords:
------------------------+-------------------
 worker_1   | 2016-06-20 14:50:36+0000 [Broker,client] message from master:
 attached
 worker_1   | 2016-06-20 14:50:36+0000 [Broker,client] Peer will receive
 following PB traceback:
 worker_1   | 2016-06-20 14:50:36+0000 [Broker,client] Unhandled Error
 worker_1   |    Traceback (most recent call last):
 worker_1   |      File "/usr/local/lib/python2.7/dist-
 packages/twisted/spread/banana.py", line 153, in gotItem
 worker_1   |        self.callExpressionReceived(item)
 worker_1   |      File "/usr/local/lib/python2.7/dist-
 packages/twisted/spread/banana.py", line 116, in callExpressionReceived
 worker_1   |        self.expressionReceived(obj)
 worker_1   |      File "/usr/local/lib/python2.7/dist-
 packages/twisted/spread/pb.py", line 565, in expressionReceived
 worker_1   |        method(*sexp[1:])
 worker_1   |      File "/usr/local/lib/python2.7/dist-
 packages/twisted/spread/pb.py", line 877, in proto_message
 worker_1   |        self._recvMessage(self.localObjectForID, requestID,
 objectID, message, answerRequired, netArgs, netKw)
 worker_1   |    --- <exception caught here> ---
 worker_1   |      File "/usr/local/lib/python2.7/dist-
 packages/twisted/spread/pb.py", line 891, in _recvMessage
 worker_1   |        netResult = object.remoteMessageReceived(self,
 message, netArgs, netKw)
 worker_1   |      File "/usr/local/lib/python2.7/dist-
 packages/twisted/spread/flavors.py", line 112, in remoteMessageReceived
 worker_1   |        raise NoSuchMethod("No such method: remote_%s" %
 (message,))
 worker_1   |    twisted.spread.flavors.NoSuchMethod: No such method:
 remote_getWorkerInfo
 worker_1   |


 I believe this is a harmless traceback. but still I had to question myself
 before understanding the problem.

 We should use auto-detect method, which does not trigger tracebacks on the
 old slaves.


 One of the easy way is to test slave first, and swallow the traceback
 inside the buildbot-worker package.

 Putting to 0.9.0 as this is the last time we have the change to fix the
 protocol.

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Ticket URL: <http://trac.buildbot.net/ticket/3567>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation