multiline

The multiline parser plugin parses multiline logs. This plugin is multiline version of regexp parser.
The multiline parser parses log with formatN and format_firstline parameters. format_firstline is for detecting start line of multiline log. formatN, N's range is 1..20, is the list of Regexp format for multiline log.
Unlike other parser plugins, this plugin needs special code in input plugin, e.g. handle format_firstline. So currently, in_tail plugin works with `multiline` but other input plugins don't work with `multiline`.
Parameters
See Parse section configurations​
format_firstline
Specify regexp pattern for start line of multiple lines. Input plugin can skip the logs until format_firstline is matched. Default is nil.
If format_firstline is not specified, input plugin should store unmatched new lines in temporary buffer and try to match buffered logs with each new line.
formatN
type
default
version
string
required parameter
0.14.0
Specify regexp patterns. For readability, you can separate regexp patterns into multiple regexpN parameters, See "Rails log" example. These patterns are joined and constructs regexp pattern with multiline mode.
Example
Rails log
<parse>
  @type multiline
  format_firstline /^Started/
  format1 /Started (?<method>[^ ]+) "(?<path>[^"]+)" for (?<host>[^ ]+) at (?<time>[^ ]+ [^ ]+ [^ ]+)\n/
  format2 /Processing by (?<controller>[^\u0023]+)\u0023(?<controller_method>[^ ]+) as (?<format>[^ ]+?)\n/
  format3 /(  Parameters: (?<parameters>[^ ]+)\n)?/
  format4 /  Rendered (?<template>[^ ]+) within (?<layout>.+) \([\d\.]+ms\)\n/
  format5 /Completed (?<code>[^ ]+) [^ ]+ in (?<runtime>[\d\.]+)ms \(Views: (?<view_runtime>[\d\.]+)ms \| ActiveRecord: (?<ar_runtime>[\d\.]+)ms\)/
</parse>
With this configuration:
Started GET "/users/123/" for 127.0.0.1 at 2013-06-14 12:00:11 +0900
Processing by UsersController#show as HTML
  Parameters: {"user_id"=>"123"}
  Rendered users/show.html.erb within layouts/application (0.3ms)
Completed 200 OK in 4ms (Views: 3.2ms | ActiveRecord: 0.0ms)
This incoming event is parsed as:
time:
1371178811 (2013-06-14 12:00:11 +0900)
​
record:
{
  "method"           :"GET",
  "path"             :"/users/123/",
  "host"             :"127.0.0.1",
  "controller"       :"UsersController",
  "controller_method":"show",
  "format"           :"HTML",
  "parameters"       :"{ \"user_id\":\"123\"}",
  ...
}
Java stacktrace log
<parse>
  @type multiline
  format_firstline /\d{4}-\d{1,2}-\d{1,2}/
  format1 /^(?<time>\d{4}-\d{1,2}-\d{1,2} \d{1,2}:\d{1,2}:\d{1,2}) \[(?<thread>.*)\] (?<level>[^\s]+)(?<message>.*)/
</parse>
With this configuration:
2013-3-03 14:27:33 [main] INFO  Main - Start
2013-3-03 14:27:33 [main] ERROR Main - Exception
javax.management.RuntimeErrorException: null
    at Main.main(Main.java:16) ~[bin/:na]
2013-3-03 14:27:33 [main] INFO  Main - End
These incoming events are parsed as:
time:
2013-03-03 14:27:33 +0900
record:
{
  "thread" :"main",
  "level"  :"INFO",
  "message":"  Main - Start"
}
​
time:
2013-03-03 14:27:33 +0900
record:
{
  "thread" :"main",
  "level"  :"ERROR",
  "message":" Main - Exception\njavax.management.RuntimeErrorException: null\n    at Main.main(Main.java:16) ~[bin/:na]"
}
​
time:
2013-03-03 14:27:33 +0900
record:
{
  "thread" :"main",
  "level"  :"INFO",
  "message":"  Main - End"
}
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.
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