Logging in Play non-blocking?

Question

Is logging in Play non-blocking? Does it use some non-blocking IO API behind the scenes? Does it schedule on some other thread pool? I tried looking at the code but couldn't figure it out from there.

Hydrocellulose

Answer 1

The documentation just says it uses logback, so I'd assume it is blocking by default and you can use AsyncAppender (note caveats) if you want async logging.

Kite

Answer 2

The logging is blocking by default, but you can configure Logback to use an AsyncAppender. Note that AsyncAppender is lossy -- it will discard debug messages if the queue is full for better performance.

http://www.playframework.com/documentation/2.3.x/SettingsLogger

Loaiasis

Answer 3

In Play 2.6, it is blocking in DEV mode and async in production. https://www.playframework.com/documentation/2.6.x/SettingsLogger

Hock