mirror of https://github.com/apache/druid.git
46 lines
1.8 KiB
Markdown
46 lines
1.8 KiB
Markdown
---
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id: middlemanager
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title: "MiddleManager service"
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---
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<!--
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~ Licensed to the Apache Software Foundation (ASF) under one
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~ or more contributor license agreements. See the NOTICE file
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~ distributed with this work for additional information
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~ regarding copyright ownership. The ASF licenses this file
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~ to you under the Apache License, Version 2.0 (the
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~ "License"); you may not use this file except in compliance
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~ with the License. You may obtain a copy of the License at
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~
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~ http://www.apache.org/licenses/LICENSE-2.0
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~
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~ Unless required by applicable law or agreed to in writing,
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~ software distributed under the License is distributed on an
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~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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~ under the License.
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### Configuration
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For Apache Druid MiddleManager service configuration, see [MiddleManager and Peons](../configuration/index.md#middlemanager-and-peons).
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For basic tuning guidance for the MiddleManager service, see [Basic cluster tuning](../operations/basic-cluster-tuning.md#middlemanager).
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### HTTP endpoints
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For a list of API endpoints supported by the MiddleManager, please see the [Service status API reference](../api-reference/service-status-api.md#middlemanager).
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### Overview
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The MiddleManager process is a worker process that executes submitted tasks. Middle Managers forward tasks to Peons that run in separate JVMs.
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The reason we have separate JVMs for tasks is for resource and log isolation. Each [Peon](../design/peons.md) is capable of running only one task at a time, however, a MiddleManager may have multiple Peons.
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### Running
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```
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org.apache.druid.cli.Main server middleManager
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```
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