druid/docs/content/design/peons.md

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Peons
-----
For Peon Configuration, see [Peon Configuration](../configuration/indexing-service-config.html).
Peons run a single task in a single JVM. MiddleManager is responsible for creating Peons for running tasks.
Peons should rarely (if ever for testing purposes) be run on their own.
Running
-------
The peon should very rarely ever be run independent of the middle manager unless for development purposes.
```
io.druid.cli.Main internal peon <task_file> <status_file>
```
The task file contains the task JSON object.
The status file indicates where the task status will be output.