[Twisted-Python] PotentialZombieWarning warning message?
Hi:
I'd like to adopt Twisted for a current project I'm coding up. I'm on
CentOS 6.7 x86-64 using python v2.6 and the stock
python-twisted-8.2.0-3.1 package built for this release.
No matter what I do when trying to implement the Process protocol or
use utils.getProcessOutput() directly, I always see the following
warning message on the console:
/usr/lib64/python2.6/site-packages/twisted/internet/utils.py:25:
PotentialZombieWarning: spawnProcess called, but the SIGCHLD handler
is not installed. This probably means you have not yet called
reactor.run, or called reactor.run(installSignalHandler=0). You will
probably never see this process finish, and it may become a zombie
process.
reactor.spawnProcess(p, executable, (executable,)+tuple(args), env, path)
...
Is there anyway to get rid of this message? I realize I'm using an
older release of twisted but I can't upgrade to the latest without
incurring the cost of installing an python v2.7 or greater.
My script is literally:
d = utils.getProcessOutput('/bin/ls')
d.addCallbacks(writeResponse, noResponse)
reactor.run()
etc.
What am I doing wrong?
-aps
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Re: [Twisted-Python] PotentialZombieWarning warning message?
On Mon, Dec 14, 2015 at 10:09 AM, Amber "Hawkie" Brown wrote: > >> On 14 Dec 2015, at 22:52, pisymbol . wrote: >> >> Hi: >> >> I'd like to adopt Twisted for a current project I'm coding up. I'm on >> CentOS 6.7 x86-64 using python v2.6 and the stock >> python-twisted-8.2.0-3.1 package built for this release. > > ... > >> Is there anyway to get rid of this message? I realize I'm using an >> older release of twisted but I can't upgrade to the latest without >> incurring the cost of installing an python v2.7 or greater. > > Hi, > > Python 2.6 has been EOL for years and Twisted 8.2.0 is nearly seven years > old. We can't really help with things that old (many, many issues have since > been fixed, so remembering what's a bug that's been squashed and what's a > platform bug is nearly impossible), but upgrading to Twisted 15.4 (the last > release with Python 2.6 support, and only 4 or so months old) may help. That maybe, but CentOS 6.7 is the latest 6.x release which ships with 8.2.x (somebody maintaining the RHEL 6.x series should update these packages then). I did a pip install and it said I needed Python 2.7 or higher. Let me reevaluate if I can just update twisted. Thanks! -aps ___ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
Re: [Twisted-Python] PotentialZombieWarning warning message?
On Mon, Dec 14, 2015 at 4:51 PM, Glyph Lefkowitz wrote: > I did a pip install and it said I needed Python 2.7 or higher. Let me > reevaluate if I can just update twisted. > > > Try `pip install twisted==15.4´ if you still require Python2.6 support; `pip > install twisted´ will install the latest, which no longer works on 2.6. Yeah, that's what I did. It's working now! > But again: Python 2.6 is unsupported by the upstream Python developers. You > really should not be using it, since it won't receive security updates (of > course, Red Hat and transitively CentOS claim to "support" these packages, > but if upstream is refusing patches at this point, it's not clear where that > support will come from). As you can imagine, this boils down to politics. > If you must use CentOS 6, then I'd recommend installing PyPy 4.0 from > https://github.com/squeaky-pl/portable-pypy#portable-pypy-distribution-for-linux > and using that. In addition to being security-supported, it will also make > your python code run 10x faster :). Interesting, I'll take a look. -aps ___ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
Re: [Twisted-Python] PotentialZombieWarning warning message?
On Mon, Dec 14, 2015 at 7:43 PM, Glyph Lefkowitz wrote: > >> On Dec 14, 2015, at 3:53 PM, pisymbol . wrote: >> >> On Mon, Dec 14, 2015 at 4:51 PM, Glyph Lefkowitz >> wrote: >>> I did a pip install and it said I needed Python 2.7 or higher. Let me >>> reevaluate if I can just update twisted. >>> >>> >>> Try `pip install twisted==15.4´ if you still require Python2.6 support; `pip >>> install twisted´ will install the latest, which no longer works on 2.6. >> >> Yeah, that's what I did. It's working now! > > Great! Glad to hear you were able to make a huge leap in Twisted versions > with little trouble :-). > >>> But again: Python 2.6 is unsupported by the upstream Python developers. You >>> really should not be using it, since it won't receive security updates (of >>> course, Red Hat and transitively CentOS claim to "support" these packages, >>> but if upstream is refusing patches at this point, it's not clear where that >>> support will come from). >> >> As you can imagine, this boils down to politics. > > I understand that things like this often do, which is exactly why I want to > make it clear that we (speaking in terms of the broader Python community now, > not just Twisted) are trying to push people towards more recent versions just > because they're more fun or more aesthetically pleasant, but because there > are very real risks associated with being on unsupported ancient versions of > things. It pains me not to be supporting a configuration that some users > want, but there is a line where "conservative about change" becomes > "negligent about maintenance" and python 2.6 crossed it a little over two > years ago :-). I'm not disagreeing with you per se...but... The fact is the Python community at large then needs to convince the distro maintainers accordingly. Telling a customer to update their entire platform for a newer version of Python isn't going to fly a lot of times (and remember, someone of them have support agreements with RH). And running two versions of Python can get messy real fast. Anyway, it is what it is. >>> If you must use CentOS 6, then I'd recommend installing PyPy 4.0 from >>> https://github.com/squeaky-pl/portable-pypy#portable-pypy-distribution-for-linux >>> and using that. In addition to being security-supported, it will also make >>> your python code run 10x faster :). >> >> Interesting, I'll take a look. > > Hope that works out for you. Good luck! Thanks! So far, so good. I was now able to lift my prototype code and integrate it with the rest. I'll probably have more questions at some point, but at least 15.4 did the trick! -aps ___ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
