id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
3741	Can't go back from Python 3 to Python 2 on a node	itamarst	itamarst	"{{{
        Traceback (most recent call last):
          File ""/home/itamarst/Devel/tahoe-lafs/venv27/lib64/python2.7/site-packages/twisted/application/app.py"", line 399, in startReactor
            self.config, oldstdout, oldstderr, self.profiler, reactor)
          File ""/home/itamarst/Devel/tahoe-lafs/venv27/lib64/python2.7/site-packages/twisted/application/app.py"", line 312, in runReactorWithLogging
            reactor.run()
          File ""/home/itamarst/Devel/tahoe-lafs/venv27/lib64/python2.7/site-packages/twisted/internet/base.py"", line 1283, in run
            self.mainLoop()
          File ""/home/itamarst/Devel/tahoe-lafs/venv27/lib64/python2.7/site-packages/twisted/internet/base.py"", line 1292, in mainLoop
            self.runUntilCurrent()
        --- <exception caught here> ---
          File ""/home/itamarst/Devel/tahoe-lafs/venv27/lib64/python2.7/site-packages/twisted/internet/base.py"", line 913, in runUntilCurrent
            call.func(*call.args, **call.kw)
          File ""/home/itamarst/Devel/tahoe-lafs/src/allmydata/storage/crawler.py"", line 281, in start_slice
            self.start_current_prefix(start_slice)
          File ""/home/itamarst/Devel/tahoe-lafs/src/allmydata/storage/crawler.py"", line 362, in start_current_prefix
            self.finished_cycle(cycle)
          File ""/home/itamarst/Devel/tahoe-lafs/src/allmydata/storage/expirer.py"", line 316, in finished_cycle
            history = pickle.load(f)
          File ""/usr/lib64/python2.7/pickle.py"", line 1384, in load
            return Unpickler(file).load()
          File ""/usr/lib64/python2.7/pickle.py"", line 864, in load
            dispatch[key](self)
          File ""/usr/lib64/python2.7/pickle.py"", line 892, in load_proto
            raise ValueError, ""unsupported pickle protocol: %d"" % proto
        exceptions.ValueError: unsupported pickle protocol: 3
}}}"	defect	closed	normal	Support Python 3	unknown	n/a	fixed