Hi Marc,
No worries. I have a somewhat unusual setup networkwise. The controller
is in a remote datacenter. The client is running in a Debian Linux image
running on my Macintosh laptop. So there are actually several layers of
firewalls involved.. but all pass ICMP packets, and I can ping the
controller from the client without problem.
The actual Carob connection is being forwarded through an SSH TCP tunnel
from the Debian image to the controller. (The client thus thinks the
controller is "localhost", which it is not.)
The thread issue may be more promising. Ruby does not support native
threading, only "green threads", a userspace cooperative threading
system that wreaks all kinds of havoc. (Among other things, it makes it
very difficult to write GUIs that also process realtime data in the
background; you have to resort to an elaborate polling/timer mechanism
to do that, which uses way more CPU than it needs to, and also can lose
data.)
I don't know how Ruby's green threads interact with native threads in an
external library. Could it be that Ruby's threading system is somehow
interfering with the pinger threads in Carob?
Best,
Paul
Marc Herbert wrote:
Paul,
Thanks a lot for the excellent report, and sorry for not being
reactive at this time.
I suspect you get different results because of timers. Carob features
pinger threads and timeouts to decide when a controller or a VDB is
available. So availability status may depend on the moment. This is
just a piece of explanation; not an excuse for the behaviour you are
experiencing, which is not normal.
Do you have some kind of firewalling between the client and the
controllers? If you block the pings, all kind of weird behaviours may
happen.
Cheers,
Marc.
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