Date Match is setting incorrect timestamp / not actually setting timestamp

Elastic Stack Logstash
#1

I have the following filter in my logstash pipeline:

    date {
      match => [ "[fields][serverrequest][starttime]", "UNIX_MS" ]
      tag_on_failure => [ "serverrequest_logstyle_dateparsefailure" ]
    }

However, the resulting document in ElasticSearch is showing a timestamp value which does not match the parsed field

e.g. document:

    @timestamp: Jan 27, 2021 @ 11:11:14.891
    fields.serverrequest.starttime: 1611722342306

Parsing that starttime on epochconverter.com gives me Wednesday, 27 January 2021 04:39:02.306 which is what I expect from the other document details, and also simply looking at the last 3 digits in the starttime field.

I can't see any backlog on the filebeat / logstash monitoring that would explain a ~7 hour delay, and I don't see any documents with a timestamp in the future.

I'm at a loss to explain what's going on.

#2

Gah, foolishly I was using the wrong syntax to access a nested field. I should have used "fields.serverrequest.starttime"

#3

No, you used the right syntax to access a nested field, I guess what you have is a field with periods in its name, which is very different.

#4

Huh.. Have I done something silly in my Grok which is using field names with periods instead of nested fields then? Here's the full section

grok {

      match => { "message" => "^%{NUMBER:fields.serverrequest.starttime}\|%{NUMBER:fields.serverrequest.responsetime:int}\|%{NUMBER:fields.serverrequest.sqltime:int}\|%{NUMBER:fields.serverrequest.querycount:int}\|%{NUMBER:fields.sql.numberofrowsread:int}\|%{NUMBER:fields.sql.resultsetopentime:int}\|%{NUMBER:fields.serverrequest.beginfreememory}\|%{NUMBER:fields.serverrequest.endfreememory}\|%{NUMBER:fields.serverrequest.totalmemory}\|%{NUMBER:fields.serverrequest.wftime:int}\|%{NUMBER:fields.serverrequest.events:int}\|%{NUMBER:fields.serverrequest.usedjdbcconnections:int}\|%{NUMBER:fields.serverrequest.available:int}\|(%{IP:fields.client.ip})?\|(%{DATA:fields.client.username}/%{DATA:fields.client.process})?\|%{NUMBER:fields.requestid:int}\|(?<fields.servername>.*?)\|%{GREEDYDATA:fields.methodcall}$"}

      tag_on_failure => [ "serverrequest_logstyle_grokparsefailure" ]

    }

    mutate {

      remove_field => [ "message" ]

      convert => { "fields.serverrequest.executetime" => "integer" }

    }

    date {

      match => [ "fields.serverrequest.starttime", "UNIX_MS" ]

      tag_on_failure => [ "serverrequest_logstyle_dateparsefailure" ]

    }
#5

That creates a field called fields.serverrequest.starttime with two periods in the name. If you want a starttime field inside the serverrequest object inside the fields object you would have to use %{NUMBER:[fields][serverrequest][starttime]}.

kibana and elasticsearch use the same name for both things, logstash does not. There was a time (around 5.x if I recall correctly) when elasticsearch disallowed periods in field names, but then later on they were allowed again.

#6

Understood, thanks very much for clarifying.

#7

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