Action return value too long for commandline

[Rick Harding]

Thanks, this is interesting to know. The fact that we've fixed it in
relation set means we have a pattern to move forward with. The team's
slammed on 2.0 work right now, but I've set this up to be something we try
to address across the board after the fact. We'll make sure to look for
other -set operations to make sure we standardize it across the board.

On Sun, Apr 3, 2016 at 10:34 PM Stuart Bishop <stuart.bishop at canonical.com>
wrote:

> On 4 April 2016 at 02:00, Merlijn Sebrechts <merlijn.sebrechts at gmail.com>
> wrote:
> > Hi all
> >
> >
> > The apache-kafka charm has an action "read-topic" that can return a lot
> of
> > data. Sometimes, this data is too long to be passed to `action-set` by
> > commandline. You get the following error:
> >
> > Traceback (most recent call last):
> >   File "actions/read-topic", line 36, in <module>
> >     hookenv.action_set({'output': output})
> >   File
> > "/usr/local/lib/python2.7/dist-packages/charmhelpers/core/hookenv.py",
> line
> > 615, in action_set
> >     subprocess.check_call(cmd)
> >   File "/usr/lib/python2.7/subprocess.py", line 535, in check_call
> >     retcode = call(*popenargs, **kwargs)
> >   File "/usr/lib/python2.7/subprocess.py", line 522, in call
> >     return Popen(*popenargs, **kwargs).wait()
> >   File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
> >     errread, errwrite)
> >   File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child
> >     raise child_exception
> > OSError: [Errno 7] Argument list too long
> >
> >
> > Is there any way to pass a file to action-set?
>
> This bug affects many of the Juju tools causing charms to fail at
> scale. https://bugs.launchpad.net/juju-core/+bug/1437366
> (relation-set) is the only one I know of that has been fixed.
> https://bugs.launchpad.net/juju-core/+bug/1274460 (juju-log) is still
> open. leader-set also fails now I think of it, but I haven't tripped
> over that one (it limits scalability the way I'm using leadershp
> settings, but I should be able to squeeze out several hundred units).
> Maybe we can use the opportunity to fix quoting and encoding issues.
>
> I suspect if you can get past command line length limitations, I
> suspect the next glass ceiling is a 16MB document size limit in
> MongoDB (which is large enough to not need fixing?)
>
> --
> Stuart Bishop <stuart.bishop at canonical.com>
>
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