3 ms·

You bring up a lot of important points none of which apply to Elixir/Phoenix. In Erlang/Elixir world you can even live upgrade a running system to a new release

by qaq 9y ago

You bring up a lot of important points none of which apply to Elixir/Phoenix. In Erlang/Elixir world you can even live upgrade a running system to a new release without restart.

jkarneges 9y ago
Can you really live upgrade an Erlang process without disconnecting TCP connections it is using? If so that's really interesting, would be curious to learn more.
- jimktrains2 9y ago
  I'm not familar with Erlang, but applications like HAProxy don't upgrade the process in use, but only new connections.
  - lazyloop 9y ago
    That's what Perl/Mojolicious does too.
  - wlll 9y ago
    May be of interest: https://news.ycombinator.com/item?id=10669131 https://news.ycombinator.com/item?id=10669131
- jeremyjh 9y ago
  Yes, you don't actually restart the Erlang VM; it loads your new application code (byte code) and sends the next message/request it receives to the newly loaded module. The default state for any process is to be blocked on receiving a new message. Processes in the middle of an I/O operation for example, will get the new code after it finishes that operation and waits to receive its next message.