sample

The in_sample input plugin generates sample events. It is useful for testing, debugging, benchmarking and getting started with Fluentd.

It is included in Fluentd's core.

This plugin is the renamed version of in_dummy.

Example Configuration

<source>
  @type sample
  sample {"hello":"world"}
  tag sample
</source>

# If you use fluentd v1.11.1 or earlier, use following configuration
<source>
  @type dummy
  dummy {"hello":"world"}
  tag dummy
</source>

Please see the Config File article for the basic structure and syntax of the configuration file.

Plugin Helpers

• thread
• storage
• See also: Input Plugin Overview

Parameters

See Common Parameters.

NOTE: sample plugin doesn't support specific Parse Parameters in <parse> section.

@type

The value must be sample.

If you use fluentd v1.11.1 or earlier, use dummy.

tag

type	default	version
string	Nothing	0.14.0

The value is the tag assigned to the generated events.

size

type	default	version
integer	1	0.14.4

The number of events in the event stream of each emit.

rate

type	default	version
integer	1	0.14.0

It configures how many events to generate per second.

auto_increment_key

type	default	version
string	nil	0.14.0

If specified, each generated event has an auto-incremented key field.

For example, with auto_increment_key foo_key, the first couple of events look like:

2014-12-14 23:23:38 +0000 test: {"message":"sample","foo_key":0}
2014-12-14 23:23:38 +0000 test: {"message":"sample","foo_key":1}
2014-12-14 23:23:38 +0000 test: {"message":"sample","foo_key":2}

suspend

type	default	version
bool	false	0.14.2

This parameter is removed since v1.10.0. This feature is automatically handled in the core.

sample

type	default	version
string	[{"message":"sample"}]	0.14.0

The sample data to be generated. It should be either an array of JSON hashes or a single JSON hash. If it is an array of JSON hashes, the hashes in the array are cycled through in order.

If you use fluentd v1.11.1 or earlier, use dummy.

reuse_record

type	default	version
bool	false	1.17.1

If specified, it reuses the previously generated sample data. This is the default behavior in v1.17.0 or older version of Fluentd.

Since v1.17.1, the default behavior was changed to copy sample data by default to avoid the impact of destructive changes by subsequent plugins.

The new default behavior (reuse_record false) increases the load when generating large amounts of sample data. You can use this new parameter to have the same performance as before with reuse_record.

Note that there is one exception not to reuse the sample data even though reuse_record is specified. If auto_increment_key was specified, reuse_record will be ignored.

If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.