| id | middlemanager |
|---|---|
| title | Middle Manager service |
| sidebar_label | Middle Manager |
The Middle Manager service is a worker service that executes submitted tasks. Middle Managers forward tasks to Peons that run in separate JVMs. Druid uses separate JVMs for tasks to isolate resources and logs. Each Peon is capable of running only one task at a time, whereas a Middle Manager may have multiple Peons.
For Apache Druid Middle Manager service configuration, see Middle Manager and Peons.
For basic tuning guidance for the Middle Manager service, see Basic cluster tuning.
For a list of API endpoints supported by the Middle Manager, see the Service status API reference.
org.apache.druid.cli.Main server middleManager