Hi,
this is my first posting in this mailing list, so if it's an RTFM question,
please
point me to the FM :-)
I would like to know what is the rationale behind using an rpc:cast from
scheduler/driver.py when e.g. launching an instance, while rpc.call in
driver.py is used only
for trivial
The use of cast is simply so we can return to the user more quickly instead of
blocking waiting for a response. There are some cases where failure handling
is a little more complicated and is simplified by using a call. The live
migration is an example of this. It is much less frequently used
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