We now fully integrate with Erlang/OTP logger.
* Logger.Formatter can now instantiate a compatible Erlamg/OTP logger formatter
* The default_handler configures the default handler
* The default_formatter configures the default formatter
* Backends front-end will be moved to logger_backends package,
but the implementation will still be shipped as part of Elixir
Previous logger versions would always compute the mode on the Logger
handler which meant that, if any other Logger handler blocked, either because
it was waiting on IO, the system is overloaded or due to long computations, a
burst of messages could make the Logger message queue grow quite large
until it notices it should change its mode.
This commit changes the computation to use a counter which is offset by
the current message length queue. This makes the following script go from
tens of thousands messages in the Logger inbox to only hundreds (assuming
a `sync_threshold` of 100) when writing a rate limited stdio with
`mix run foo.exs | pv -p -L 1k 1>/dev/null`:
```elixir
require Logger
# monitor memory
# :observer.start()
defmodule Loop do
def run() do
Logger.info(inspect(:crypto.strong_rand_bytes(1024)))
Process.sleep(10)
run()
end
end
for _i <- 1..100 do
spawn(fn ->
Loop.run()
end)
end
defmodule OtherLoop do
def run() do
IO.inspect(:stderr, Process.info(Process.whereis(Logger), :message_queue_len), [])
IO.inspect(:stderr, :ets.tab2list(Logger.Config), [])
Process.sleep(100)
run()
end
end
OtherLoop.run()
```
Jonatan Männchen
José Valim
Andrea Leopardi
Łukasz Jan Niemier
José Valim
José Valim
Aleksei Magusev
Wojtek Mach
James Fish