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https://issues.apache.org/jira/browse/TC-374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120083#comment-16120083
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Dylan Volz edited comment on TC-374 at 8/9/17 4:00 PM:
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This means the processes were orphaned, and adopted by root (as expected) but
then never waited on (reaped). I happened to have just read about a similar
issue docker can have here:
https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/.
Seems that hypnotoad (wrapping Mojo::Server::Prefork) should be handling this
and it will require some digging, I think some tooling using
http://mojolicious.org/perldoc/Mojo/Server/Prefork#reap
and http://mojolicious.org/perldoc/Mojo/Server/Prefork#spawn may help
illuminate what is going on.
was (Author: dylan_volz):
This means the processes were orphaned, and adopted by root (as expected) but
then never waited on (reaped). I happened to have just read about a similar
issue docker can have here:
https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/
that describes it in detail and perhaps a similar solution can be applied in
our start up script.
> `systemctl stop traffic_ops` does not kill all processes
> --------------------------------------------------------
>
> Key: TC-374
> URL: https://issues.apache.org/jira/browse/TC-374
> Project: Traffic Control
> Issue Type: Bug
> Components: Traffic Ops
> Affects Versions: 2.1.0
> Reporter: Dan Kirkwood
> Labels: systemctl
> Fix For: 2.1.0
>
>
> not sure why it gets in this state, but traffic_ops processes sometimes get
> in a state where the parent process is the root (1) for many of the
> script/cdn workers. The init.d script doesn't stop them because they don't
> match the pid in `/var/run/traffic_ops.pid`.
> This needs to be more robust.
> Example: on my test VM, if I run this, I see multiple parent processes:
> {quote}
> ps -ef | grep script/cdn|grep -v root | awk '\{print $3\}' | sort -u
> 1
> 22713
> 29306
> {quote}
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