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Signals

Karafka responds to few signals. On a Unix machine, you can use the kill binary or the Process.kill API in Ruby, e.g.

kill -TTIN pid
Process.kill("TTIN", pid)

TTIN

Karafka will respond to TTIN by printing backtraces for all threads to the logger. This is useful for debugging if you have a Karafka process that appears dead or stuck.

Note: You need to have the LoggerListener enabled for this signal to print. It is enabled by default, so this signal should work out of the box unless you altered that.

TERM and QUIT

Send TERM or QUIT signal to a Karafka process to shut it down. It will stop accepting new work but continue working on current messages. Workers who do not finish within the shutdown_timeout are forcefully terminated.