[erlang-questions] Lager fatal errors when starting an application using erlsrv, but not werl

Sean Cribbs sean@REDACTED
Wed Feb 4 02:59:40 CET 2015

Hi Jim,

When you run headless, there is no console/tty/stdio/etc. In Riak, we solve
this using run_erl, which creates UNIX FIFO files that can be attached to
separately and replace the standard in/out. I suspect there's nothing
similar on Windows and this is the problem you're running into.
Unfortunately we don't yet run on Windows.

However, we also found console output to have a significant impact on
performance in many cases, so in production deploys we generally exclude it
and just send it to a file instead.

On Tue, Feb 3, 2015 at 1:47 PM, jim rosenblum <jim.rosenblum@REDACTED>

> I have an application that uses Lager. I have created packages for Mac
> OSx, RedHat, Ubuntu and Windows and I have a problem that *only* manifests
> itself on Windows when my application is started via erlsrv - starting with
> werl.exe is fine.
> I register the process via the cmd file produced by Rebar, called jc.cmd
> in my case.
> When I start it in a console (i.e., 1> jc.cmd console), all is good, but
> when I start via '2> jc.cmd start' I get the following errors:
> 2015-02-03 08:07:31.394 [error] <0.73.0>@lager_handler_watcher:98 Lager
> fatally failed to install handler lager_console_backend into lager_event,
> NOT retrying: old_shell
> 2015-02-03 08:07:31.394 [warning] <0.68.0>@lager_console_backend:64
> Lager's console backend is incompatible with the 'old' shell, not enabling
> it
> The console command uses werl.exe, the start command uses erlsrv.
> Can anyone help?
> thanks
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Sean Cribbs <sean@REDACTED>
Sr. Software Engineer
Basho Technologies, Inc.
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