elasticsearch - 流利的错误: “buffer space has too many data”

Question

我正在kubernetes集群中使用fluentd从pod收集日志并将其发送到elasticseach。
一两天一次，fluent就会得到错误:

[warn]: #0 emit transaction failed: error_class=Fluent::Plugin::Buffer::BufferOverflowError error=“buffer space has too many data” location=“/fluentd/vendor/bundle/ruby/2.6.0/gems/fluentd-1.7.4/lib/fluent/plugin/buffer.rb:265:in `write’”

流利的语言会停止发送日志，直到我重置流利的语言 Pane 为止。

如何避免出现此错误？

也许我需要更改我的配置？

<match filter.Logs.**.System**>
  @type elasticsearch
  host "#{ENV['FLUENT_ELASTICSEARCH_HOST']}"
  port "#{ENV['FLUENT_ELASTICSEARCH_PORT']}"
  scheme "#{ENV['FLUENT_ELASTICSEARCH_SCHEME']}"
  user "#{ENV['FLUENT_ELASTICSEARCH_USER']}"
  password "#{ENV['FLUENT_ELASTICSEARCH_PASSWORD']}"

  logstash_format true
  logstash_prefix system
  type_name systemlog
  time_key_format %Y-%m-%dT%H:%M:%S.%NZ
  time_key time
  log_es_400_reason true
  <buffer>
    flush_thread_count "#{ENV['FLUENT_ELASTICSEARCH_BUFFER_FLUSH_THREAD_COUNT'] || '8'}"
    flush_interval "#{ENV['FLUENT_ELASTICSEARCH_BUFFER_FLUSH_INTERVAL'] || '5s'}"
    chunk_limit_size "#{ENV['FLUENT_ELASTICSEARCH_BUFFER_CHUNK_LIMIT_SIZE'] || '8M'}"
    queue_limit_length "#{ENV['FLUENT_ELASTICSEARCH_BUFFER_QUEUE_LIMIT_LENGTH'] || '32'}"
    retry_max_interval "#{ENV['FLUENT_ELASTICSEARCH_BUFFER_RETRY_MAX_INTERVAL'] || '30'}"
    retry_forever true
  </buffer>
</match>

Answer 1

默认的缓冲区类型是内存检查:https://github.com/uken/fluent-plugin-elasticsearch/blob/master/lib/fluent/plugin/out_elasticsearch.rb#L63

这种类型的缓冲区有两个缺点
-如果重新启动Pod或容器，则缓冲区中的日志将丢失。
-如果分配给流利的所有RAM已被消耗，则不再发送日志

尝试通过以下配置使用基于文件的缓冲区

<buffer>
    @type file
    path /fluentd/log/elastic-buffer
    flush_thread_count 8
    flush_interval 1s
    chunk_limit_size 32M
    queue_limit_length 4
    flush_mode interval
    retry_max_interval 30
    retry_forever true
  </buffer>