Redis output plugin

edit
  • Plugin version: v4.0.4
  • Released on: 2018-04-06
  • Changelog

For other versions, see the Versioned plugin docs.

Installation

edit

For plugins not bundled by default, it is easy to install by running bin/logstash-plugin install logstash-output-redis. See Working with plugins for more details.

Getting Help

edit

For questions about the plugin, open a topic in the Discuss forums. For bugs or feature requests, open an issue in Github. For the list of Elastic supported plugins, please consult the Elastic Support Matrix.

Description

edit

This output will send events to a Redis queue using RPUSH. The RPUSH command is supported in Redis v0.0.7+. Using PUBLISH to a channel requires at least v1.3.8+. While you may be able to make these Redis versions work, the best performance and stability will be found in more recent stable versions. Versions 2.6.0+ are recommended.

For more information, see the Redis homepage

Redis Output Configuration Options

edit

This plugin supports the following configuration options plus the Common Options described later.

Also see Common Options for a list of options supported by all output plugins.

 

batch

edit
  • Value type is boolean
  • Default value is false

Set to true if you want Redis to batch up values and send 1 RPUSH command instead of one command per value to push on the list. Note that this only works with data_type="list" mode right now.

If true, we send an RPUSH every "batch_events" events or "batch_timeout" seconds (whichever comes first). Only supported for data_type is "list".

batch_events

edit
  • Value type is number
  • Default value is 50

If batch is set to true, the number of events we queue up for an RPUSH.

batch_timeout

edit
  • Value type is number
  • Default value is 5

If batch is set to true, the maximum amount of time between RPUSH commands when there are pending events to flush.

congestion_interval

edit
  • Value type is number
  • Default value is 1

How often to check for congestion. Default is one second. Zero means to check on every event.

congestion_threshold

edit
  • Value type is number
  • Default value is 0

In case Redis data_type is list and has more than @congestion_threshold items, block until someone consumes them and reduces congestion, otherwise if there are no consumers Redis will run out of memory, unless it was configured with OOM protection. But even with OOM protection, a single Redis list can block all other users of Redis, until Redis CPU consumption reaches the max allowed RAM size. A default value of 0 means that this limit is disabled. Only supported for list Redis data_type.

data_type

edit
  • Value can be any of: list, channel
  • There is no default value for this setting.

Either list or channel. If data_type is list, then we will set RPUSH to key. If data_type is channel, then we will PUBLISH to key.

  • Value type is number
  • Default value is 0

The Redis database number.

host

edit
  • Value type is array
  • Default value is ["127.0.0.1"]

The hostname(s) of your Redis server(s). Ports may be specified on any hostname, which will override the global port config. If the hosts list is an array, Logstash will pick one random host to connect to, if that host is disconnected it will then pick another.

For example:

    "127.0.0.1"
    ["127.0.0.1", "127.0.0.2"]
    ["127.0.0.1:6380", "127.0.0.1"]

key

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

The name of a Redis list or channel. Dynamic names are valid here, for example logstash-%{type}.

password

edit
  • Value type is password
  • There is no default value for this setting.

Password to authenticate with. There is no authentication by default.

port

edit
  • Value type is number
  • Default value is 6379

The default port to connect on. Can be overridden on any hostname.

reconnect_interval

edit
  • Value type is number
  • Default value is 1

Interval for reconnecting to failed Redis connections

shuffle_hosts

edit
  • Value type is boolean
  • Default value is true

Shuffle the host list during Logstash startup.

timeout

edit
  • Value type is number
  • Default value is 5

Redis initial connection timeout in seconds.

Common Options

edit

The following configuration options are supported by all output plugins:

Setting Input type Required

codec

codec

No

enable_metric

boolean

No

id

string

No

codec

edit
  • Value type is codec
  • Default value is "json"

The codec used for output data. Output codecs are a convenient method for encoding your data before it leaves the output without needing a separate filter in your Logstash pipeline.

enable_metric

edit
  • 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.

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

Add a unique ID to the plugin configuration. If no ID is specified, Logstash will generate one. It is strongly recommended to set this ID in your configuration. This is particularly useful when you have two or more plugins of the same type. For example, if you have 2 redis outputs. Adding a named ID in this case will help in monitoring Logstash when using the monitoring APIs.

output {
  redis {
    id => "my_plugin_id"
  }
}