Force flushing buffered events

[Jack Xue]

When and how will fluentd force flushing the buffer? How to monitor fluentd's buffer size to see any lag?

Thanks.

2014-10-01 03:07:01 -0400 [debug]: fluent/supervisor.rb:315:block in install_supervisor_signal_handlers: fluentd supervisor process get SIGUSR1

2014-10-01 03:07:01 -0400 [debug]: fluent/supervisor.rb:446:block in install_main_process_signal_handlers: fluentd main process get SIGUSR1

2014-10-01 03:07:01 -0400 [info]: fluent/supervisor.rb:447:block in install_main_process_signal_handlers: force flushing buffered events

[Masahiro Nakagawa]

Hi Jack,

> When and how will fluentd force flushing the buffer?

fluentd flushes the buffer when receives USR1 signal.

http://docs.fluentd.org/articles/signals#sigusr1

And if you use memory buffer for BufferedOutput plugin,

fluentd flushes the buffer during shutdown phase.

> How to monitor fluentd's buffer size to see any lag?

http://docs.fluentd.org/articles/monitoring#monitoring-agent

You can use in_monitor_agent plugin to check each plugin.

In addition, if you have a Treasure Data account, then

Treasure Agent Monitoring Service is an another option.

http://docs.treasuredata.com/articles/treasure-agent-monitoring-service

Thanks,

Masahiro

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[Gonzague Dambricourt]

Hey Masahiro

In my logs at 6h25am every day I seem to get 

2017-05-08 06:25:01 +0200 [info]: #0 force flushing buffered events

Is it an expected behaviour ? :)

Thanks !

Gonzague 

[Mr. Fiber]

> Is it an expected behaviour ? :)

It depends on your environment because its log is generated when fluentd got USR1 signal.

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[Gonzague Dambricourt]

Yeah but what generates this USR1 signal ?  

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