Metricbeat Docker module doesn't shutdown immediatelly

[tsg]

Terminating Metricbeat with the docker module loaded doesn't seem to work until one period passes.

To reproduce:

• Do a basic configuration like:

- module: docker
  metricsets: ["cpu", "info", "memory", "network", "diskio", "container"]
  enabled: true
  period: 10s
  #hosts: ["localhost"]
  socket: unix:///var/run/docker.sock

• Start metricbeat
• Press ^C

Happens:

• It takes up to 10s for metricbeat to shutdown

[ruflin]

The reason metricbeat does not directly shutdown is that fetching the docker stats takes at least 2 seconds: https://github.com/docker/docker/blob/master/cli/command/container/stats_helpers.go#L148 Unfortunately for a longer list of containers this can take a lot more time. We should find a way to stop the fetching loop.

[ruflin]

Closing this as the docker client is now setup with a timeout means it will block only based on the timeout and not until all is completed.