Fluentd 0.14 -> out_forward: old configuration for buffer is not accepted.

[dsalbert]

Hi,

I'm trying to use flush_interval option in configuration of fluentd 0.14 and I got warning during start that these parameter is not used.

2016-11-29 14:54:10 +0000 [warn]: fluent/engine.rb:107:block in run_configure: parameter 'flush_interval' in <match kubernetes.**>
  @type forward
  @log_level "info"
  send_timeout 30s
  recover_wait 10s
  heartbeat_type tcp
  heartbeat_interval 1s
  phi_threshold 16
  hard_timeout 60s
  flush_interval 10s
  <server>
    name "os-fluentd-development"
    host "os-fluentd-development"
    port 4000
    weight 100
  </server>
</match> is not used.

So I used section and it works:

 64 <match kubernetes.**>
 65   @type forward
 66   @log_level info
 67   send_timeout 30s
 68   recover_wait 10s
 69   heartbeat_type tcp
 70   heartbeat_interval 1s
 71   phi_threshold 16
 72   hard_timeout 60s
 73 
 74   <buffer tag>
 75     flush_mode interval
 76     retry_type exponential_backoff
 77     @type memory
 78     flush_interval 2s
 79     retry_max_interval 10s
 80     chunk_limit_size 2m
 81     queue_length_limit 256
 82   </buffer>
 83 
 84   <server>
 85       name "#{ENV['FLUENTD_CLUSTER']}"
 86       host "#{ENV['FLUENTD_CLUSTER']}"
 87       port "#{ENV['FLUENTD_CLUSTER_PORT']}"
 88       weight 100
 89   </server>
 90 </match>

According to conversation on fluentd slack channel, this might be related to bug in out_forward pluging related to accepting old configuration.

Thanks,
Daniel

[tagomoris]

Thank you to report it! I pushed a pull-request to fix this issue. #1337.