fluent-plugin-elasticsearch：“无法将日志推送到Elasticsearch”错误，错误为“ error” => {“ type” =>“ mapper_parsing_exception”}

Question

当我使用fluent-plugin-elasticsearch将Fluentd收集的数据注入Elasticsearch时，某些数据导致以下错误：

2017-04-09 23:47:37 +0900 [error]: Could not push log to Elasticsearch: {"took"=>3, "errors"=>true, "items"=>[{"index"=>{"_index"=>"logstash-201704", "_type"=>"ruby", "_id"=>"AVtTLz_cUzkwT9CQCxrH", "status"=>400, "error"=>{"type"=>"mapper_parsing_exception", "reason"=>"failed to parse [message]", "caused_by"=>{"type"=>"illegal_state_exception", "reason"=>"Can't get text on a START_OBJECT at 1:27"}}}}, .....]}

似乎Elasticsearch禁止对数据进行错误failed to parse [message] ， Can't get text on a START_OBJECT at 1:27 failed to parse [message]并且Can't get text on a START_OBJECT at 1:27 。 但是我看不到有什么数据发送到Elasticsearch，什么地方出错了。

有任何想法吗？

Answer 1

fluent-plugin-elasticsearch elasticsearch使用_bulk API发送数据。 我将请求转储代码放在/opt/td-agent/embedded/lib/ruby/gems/2.1.0/gems/elasticsearch-api-5.0.4/lib/elasticsearch/api/actions/bulk.rb ，如下所示：

  def bulk(arguments={})
    ...
      payload = body
    end
    $log.info([method, path, params, payload].inspect)  # <=== here ($log is global logger of fluentd)
    perform_request(method, path, params, payload).body

我发现发送到Elasticsearch的请求如下：

POST /_bulk
{"index":{"_index":"logstash-201704","_type":"ruby"}}
{"level":"INFO","message":{"status":200,"time":{"total":46.26,"db":33.88,"view":12.38},"method":"PUT","path":"filtered","params":{"time":3815.904,"chapter_index":0},"response":[{}]},"node":"main","time":"2017-04-09T14:39:06UTC","tag":"filtered.console","@timestamp":"2017-04-09T23:39:06+09:00"}

问题是message字段包含JSON对象，尽管此字段在Elasticsearch上已映射为已分析的字符串。