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rosnode zombies

rosnode

asked 2011-03-22 01:33:35 -0500

baxelrod

794 ●20 ●24 ●34 http://benaxelrod.com/

Sometimes when a node crashes, or I kill it, it still shows up in rosnode list. I don't seem to be able to find the process using ps. And the node does not go away in the list when i do a rosnode kill <node>. I have seen this with both 'regular' nodes as well as ros tools such as rostopic.

The only thing that seems to work is to kill and restart the roscore.

This is not a major issue for me, I was just wondering what was going on here.

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answered 2011-03-22 04:23:19 -0500

kwc
12244 ●54 ●90 ●132 http://kwc.org/

Registrations in the master currently don't expire -- we plan on adding in a TTL. You can remove these stale registrations by running "rosnode cleanup". This will remove the registration of any node that cannot be contacted immediately (buyer beware).

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Cool. The 'cleanup' subcommand isn't mentioned on the rosnode wiki page, and also not in the help text ('rosnode -h'). Is there a reason it is undocumented?

Patrick Bouffard ( 2011-03-22 05:07:21 -0500 )edit

The cleanup command is a stop gap. It's use is not encouraged in normal operation. It's benefit is aesthetic and it has the downside of potentially unregistering functioning nodes.