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Guillaume,

On 25/06/2015 13:40, Guillaume Lefranc wrote:
> Just a suggestion, you can try adding "set -x" to
> /usr/bin/wsrep_sst_rsync, so the script will dump its output in the
> log. You should be able to know where it hangs precisely then.

It gives me the following sequence repating forever:

+ check_pid_and_port /var/lib/mysql//rsync_sst.pid 20189 4444
+ local pid_file=/var/lib/mysql//rsync_sst.pid
+ local rsync_pid=20189
+ local rsync_port=4444
+ which lsof
++ lsof -i :4444 -Pn
++ grep '(LISTEN)'
+ local port_info=
++ echo
++ grep -w '^rsync[[:space:]]\+20189'
+ local is_rsync=
+ '[' -n '' -a -z '' ']'

It seems to correspond to lines 281--284:
until check_pid_and_port $RSYNC_PID $RSYNC_REAL_PID $RSYNC_PORT
    do
        sleep 0.2
    done

check_pid_and_port seems to be checking that rsync is running and
listening, basically. Strange thing is: lsof -i :4444 -Pn doesn't
return anything although ps shows that rsync was invoked correctly:
rsync --daemon --no-detach --port 4444 --config
/var/lib/mysql//rsync_sst.conf

Actually, lsof -i :4444 -Pn seems to behave rather differently on my
laptop (ubuntu) and on buildroot. Indeed, lsof in buildroot is
provided by busybox by default. This sometimes leads to significant
differences. I'm going to rebuild my system with the real lsof package
and see if it gets better. I'll let you know.

>
> You can also try to run the SST command manually on the nodes, and
> see what it does. You can get the full command output in ps so
> you're free to start a donor on one node and a joiner on another
> node and follow the script output.

I did, and it fails because some variables are unbound. I think this
is specific to manual invokation.

- --
Sylvain Raybaud
www.green-communications.fr

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