Logstash 6.6.0 sends logs to ES only few hours a day

(Jaepyoung Kim) #1

I have several Elastic Searches clusters in several Kubernetes Clusters.

Several VMs are sending the logs through filebeat to Logstash.
Some logs show very wired pattern.

The following graph shows that the logs were sent to ES at 5:-00 pm for about one hour.

It seems like filebeat publishes logs correctly, but the logs were shown only for one hour.
Filebeat version is 6.2, Logstash version is 6.6, ES is 6.6. Log file is renamed everyday .

In logstash I am getting a lot of Warning. I am not sure the issue is related with the following warnings.

[2019-04-16T04:25:23,598][WARN ][logstash.outputs.elasticsearch] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"filebeat-2019.04.16", :_type=>"doc", :routing=>nil}, #LogStash::Event:0x3c24012d], :response=>{"index"=>{"_index"=>"filebeat-2019.04.16", "_type"=>"doc", "_id"=>"xxxxxxxxx", "status"=>400, "error"=>{"type"=>"mapper_parsing_exception", "reason"=>"failed to parse field [host] of type [text]", "caused_by"=>{"type"=>"illegal_state_exception", "reason"=>"Can't get text on a START_OBJECT at 1:241"}}}}}


Hi @Jaepyoung_Kim,

are you 100% sure you have Filebeat 6.2 everywhere? I think it was in Filebeat 6.3 that a new namespace for host was introduced to be compatible with other beats.

This caused me some gray hairs :slight_smile:

If the root cause would be this then either upgrade Filebeat everywhere to at least 6.3 (although this fix might only be effective when the next new index is created.

Or add the Filebeat version to the Elasticsearch index name

index => "%{[@metadata][beat]}-%{[@metadata][version]}-%{+YYYY.MM.dd}"

Or do some Logstash filtering (which is what I did but I'm trying to drop it now)

  # Dealing with host name space change in Filebeat 6.3.0
  # Should be removed in favour of the new version for compatibility with Metricbeat
  if [@metadata][beat] {
    mutate {
      remove_field => [ "[host]" ]
    mutate {
      add_field => {
    	  "host" => "%{[beat][hostname]}"

This is to prevent field type collision which causes Logstash to drop documents because Elasticsearch rejects them.

This is a per index limitation. Implementing a fix might not be visible before the new daily index is created. You can get around that by making a temporary new daily index.

(Jaepyoung Kim) #3

Thanks a lot for your answer. Actually, there are multiple filebeats versions in the system, and also different systems are using the one index so there are some type conflicts between systems. First, I will work with team removing these issues by upgrading filebeat versions.