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split

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split

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Version: 3.1.1
Released on: 2016-07-14
Changelog
Compatible: 5.1.1.1, 5.0.0, 2.4.1, 2.4.0, 2.3.4

The split filter clones an event by splitting one of its fields and placing each value resulting from the split into a clone of the original event. The field being split can either be a string or an array.

An example use case of this filter is for taking output from the exec input plugin which emits one event for the whole output of a command and splitting that output by newline - making each line an event.

Split filter can also be used to split array fields in events into individual events. A very common pattern in JSON & XML is to make use of lists to group data together.

For example, a json structure like this:

{ field1: ...,
 results: [
   { result ... },
   { result ... },
   { result ... },
   ...
] }

The split filter can be used on the above data to create separate events for each value of results field

filter {
 split {
   field => "results"
 }
}

The end result of each split is a complete copy of the event with only the current split section of the given field changed.

Synopsis

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This plugin supports the following configuration options:

Required configuration options:

split {
}

Available configuration options:

Setting	Input type	Required	Default value
`add_field`	hash	No	`{}`
`add_tag`	array	No	`[]`
`enable_metric`	boolean	No	`true`
`field`	string	No	`"message"`
`id`	string	No
`periodic_flush`	boolean	No	`false`
`remove_field`	array	No	`[]`
`remove_tag`	array	No	`[]`
`target`	string	No
`terminator`	string	No	`"\n"`

Details

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`add_field`

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Value type is hash
Default value is {}

If this filter is successful, add any arbitrary fields to this event. Field names can be dynamic and include parts of the event using the %{field}.

Example:

    filter {
      split {
        add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
      }
    }
[source,ruby]
    # You can also add multiple fields at once:
    filter {
      split {
        add_field => {
          "foo_%{somefield}" => "Hello world, from %{host}"
          "new_field" => "new_static_value"
        }
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add field foo_hello if it is present, with the value above and the %{host} piece replaced with that value from the event. The second example would also add a hardcoded field.

`add_tag`

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Value type is array
Default value is []

If this filter is successful, add arbitrary tags to the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      split {
        add_tag => [ "foo_%{somefield}" ]
      }
    }
[source,ruby]
    # You can also add multiple tags at once:
    filter {
      split {
        add_tag => [ "foo_%{somefield}", "taggedy_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add a tag foo_hello (and the second example would of course add a taggedy_tag tag).

`enable_metric`

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Value type is boolean
Default value is true

Disable or enable metric logging for this specific plugin instance by default we record all the metrics we can, but you can disable metrics collection for a specific plugin.

`field`

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Value type is string
Default value is "message"

The field which value is split by the terminator. Can be a multiline message or the ID of an array. Nested arrays are referenced like: "[object_id][array_id]"

`id`

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Value type is string
There is no default value for this setting.

Add a unique ID to the plugin instance, this ID is used for tracking information for a specific configuration of the plugin.

output {
 stdout {
   id => "ABC"
 }
}

If you don’t explicitely set this variable Logstash will generate a unique name.

`periodic_flush`

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Value type is boolean
Default value is false

Call the filter flush method at regular interval. Optional.

`remove_field`

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Value type is array
Default value is []

If this filter is successful, remove arbitrary fields from this event. Fields names can be dynamic and include parts of the event using the %{field} Example:

    filter {
      split {
        remove_field => [ "foo_%{somefield}" ]
      }
    }
[source,ruby]
    # You can also remove multiple fields at once:
    filter {
      split {
        remove_field => [ "foo_%{somefield}", "my_extraneous_field" ]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the field with name foo_hello if it is present. The second example would remove an additional, non-dynamic field.

`remove_tag`

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Value type is array
Default value is []

If this filter is successful, remove arbitrary tags from the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      split {
        remove_tag => [ "foo_%{somefield}" ]
      }
    }
[source,ruby]
    # You can also remove multiple tags at once:
    filter {
      split {
        remove_tag => [ "foo_%{somefield}", "sad_unwanted_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the tag foo_hello if it is present. The second example would remove a sad, unwanted tag as well.

`target`

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Value type is string
There is no default value for this setting.

The field within the new event which the value is split into. If not set, the target field defaults to split field name.

`terminator`

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Value type is string
Default value is "\n"

The string to split on. This is usually a line terminator, but can be any string. If you are splitting a JSON array into multiple events, you can ignore this field.

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