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fluent-plugin: Mark as multi-workers ready #709

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Jul 5, 2019
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fluent-plugin: Mark as multi-workers ready #709

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b6ec2a4
fluent-plugin: Mark as multi-workers ready
laitalaj Jul 1, 2019
b4266f4
fluent-plugin: Add info on multi-worker usage to README
laitalaj Jul 3, 2019
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21 changes: 21 additions & 0 deletions fluentd/fluent-plugin-grafana-loki/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,27 @@ In your Fluentd configuration, use `@type loki`. Additional configuration is opt
</match>
```

### Multi-worker usage

Loki doesn't currently support out-of-order inserts - if you try to insert a log entry an earlier timestamp after a log entry with with identical labels but a later timestamp, the insert will fail with `HTTP status code: 500, message: rpc error: code = Unknown desc = Entry out of order`. Therefore, in order to use this plugin in a multi worker Fluentd setup, you'll need to include the worker ID in the labels.

For example, using [fluent-plugin-record-modifier](https://github.com/repeatedly/fluent-plugin-record-modifier):
```
<filter mytag>
@type record_modifier
<record>
fluentd_worker "#{worker_id}"
</record>
</filter>

<match mytag>
@type loki
# ...
label_keys "fluentd_worker"
# ...
</match>
```

## Docker Image

There is a Docker image `grafana/fluent-plugin-grafana-loki:master` which contains default configuration files to git log information
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4 changes: 4 additions & 0 deletions fluentd/fluent-plugin-grafana-loki/lib/fluent/plugin/out_loki.rb
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Expand Up @@ -63,6 +63,10 @@ def configure(conf)
@label_keys = @label_keys.split(/\s*,\s*/) if @label_keys
end

def multi_workers_ready?
true
end

def http_opts(uri)
opts = {
use_ssl: uri.scheme == 'https'
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