Fluentd process continues to restart if ConfigError raised

[tagomoris]

When I wrote a configuration file which raises configuration errors, Fluentd v0.14 continues to restart until I makhde Ctrl-c.

MBA:fluentd tagomoris$ cat yay.conf
<source>
  @type yay
</source>
MBA:fluentd tagomoris$ bundle exec bin/fluentd -c yay.conf 
2016-08-24 19:45:47 +0900 [info]: reading config file path="yay.conf"
2016-08-24 19:45:47 +0900 [info]: starting fluentd-0.14.2
2016-08-24 19:45:47 +0900 [info]: spawn command to main: /Users/tagomoris/.rbenv/versions/2.3.1/bin/ruby -Eascii-8bit:ascii-8bit  -rbundler/setup bin/fluentd -c yay.conf --under-supervisor
2016-08-24 19:45:47 +0900 [info]: reading config file path="yay.conf"
2016-08-24 19:45:47 +0900 [info]: starting fluentd-0.14.2 without supervision
2016-08-24 19:45:47 +0900 [info]: gem 'fluentd' version '0.14.2'
2016-08-24 19:45:47 +0900 [info]: adding source type="yay"
2016-08-24 19:45:47 +0900 [error]: config error file="yay.conf" error="Unknown input plugin 'yay'. Run 'gem search -rd fluent-plugin' to find plugins"
2016-08-24 19:45:47 +0900 [info]: Worker 0 finished unexpectedly with status 1
2016-08-24 19:45:48 +0900 [info]: reading config file path="yay.conf"
2016-08-24 19:45:48 +0900 [info]: starting fluentd-0.14.2 without supervision
2016-08-24 19:45:48 +0900 [info]: gem 'fluentd' version '0.14.2'
2016-08-24 19:45:48 +0900 [info]: adding source type="yay"
2016-08-24 19:45:48 +0900 [error]: config error file="yay.conf" error="Unknown input plugin 'yay'. Run 'gem search -rd fluent-plugin' to find plugins"
2016-08-24 19:45:48 +0900 [info]: Worker 0 finished unexpectedly with status 1
2016-08-24 19:45:49 +0900 [info]: reading config file path="yay.conf"
2016-08-24 19:45:49 +0900 [info]: starting fluentd-0.14.2 without supervision
2016-08-24 19:45:49 +0900 [info]: gem 'fluentd' version '0.14.2'
2016-08-24 19:45:49 +0900 [info]: adding source type="yay"
2016-08-24 19:45:49 +0900 [error]: config error file="yay.conf" error="Unknown input plugin 'yay'. Run 'gem search -rd fluent-plugin' to find plugins"
2016-08-24 19:45:49 +0900 [info]: Worker 0 finished unexpectedly with status 1
2016-08-24 19:45:49 +0900 [info]: reading config file path="yay.conf"
2016-08-24 19:45:49 +0900 [info]: starting fluentd-0.14.2 without supervision
2016-08-24 19:45:49 +0900 [info]: gem 'fluentd' version '0.14.2'
2016-08-24 19:45:49 +0900 [info]: adding source type="yay"
2016-08-24 19:45:49 +0900 [error]: config error file="yay.conf" error="Unknown input plugin 'yay'. Run 'gem search -rd fluent-plugin' to find plugins"
2016-08-24 19:45:50 +0900 [info]: Worker 0 finished unexpectedly with status 1
^C2016-08-24 19:45:50 +0900 [info]: Received graceful stop
/Users/tagomoris/github/fluentd/lib/fluent/configurable.rb:21:in `require': Interrupt
    from /Users/tagomoris/github/fluentd/lib/fluent/configurable.rb:21:in `<top (required)>'
    from /Users/tagomoris/github/fluentd/lib/fluent/config.rb:19:in `require'
    from /Users/tagomoris/github/fluentd/lib/fluent/config.rb:19:in `<top (required)>'
    from /Users/tagomoris/github/fluentd/lib/fluent/supervisor.rb:20:in `require'
    from /Users/tagomoris/github/fluentd/lib/fluent/supervisor.rb:20:in `<top (required)>'
    from /Users/tagomoris/github/fluentd/lib/fluent/command/fluentd.rb:19:in `require'
    from /Users/tagomoris/github/fluentd/lib/fluent/command/fluentd.rb:19:in `<top (required)>'
    from bin/fluentd:5:in `require'
    from bin/fluentd:5:in `<main>'
2016-08-24 19:45:50 +0900 [info]: Worker 0 finished with signal SIGINT

I expected that Fluentd doesn't restart for configuration errors.