[ros-users] RFC: warning for (lacking) queue_size for python publishers in Indigo?

Benjamin Charrow bcharrow at seas.upenn.edu
Thu Mar 6 18:13:25 UTC 2014

+1 for a warning; I've definitely gotten bitten by this issue when
controlling a robot over wifi.


On Thu, Mar 6, 2014 at 4:20 AM, Paul Mathieu
<paul.mathieu at pal-robotics.com>wrote:

> Right now, it appears that the default setting is easily broken for a
>> minority of use cases and non-intuitive to debug. And that would be good to
>> amend. Better to have it working everywhere and optimisable for power use
>> cases.
>> Adding some notes on the wiki probably won't do much to notify existing
>> users - typically copy/pasting from nearby code what I do.
>> So back to my earlier question - is setting a queue size expensive in the
>> python implementation? If there isn't a technical weakness there, then I'm
>> all for a) warnings and a migration point sometime in the future - it
>> wouldn't be very costly to mechanically search and destroy all
>> rospy.Publisher instances in a ros workspace.
> I agree with Daniel. Changing the default will break existing code, but if
> the default is undesirable in a non-negligible amount of cases, then it
> should be changed.
> I would be in favor for a warning in Indigo, and a change of behavior in
> J-turtle.
> Paul
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