mirror of https://github.com/apache/druid.git
52 lines
2.0 KiB
Markdown
52 lines
2.0 KiB
Markdown
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---
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id: indexing-service
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title: "Indexing 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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~ KIND, either express or implied. See the License for the
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~ specific language governing permissions and limitations
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~ under the License.
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-->
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The Apache Druid (incubating) indexing service is a highly-available, distributed service that runs indexing related tasks.
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Indexing [tasks](../ingestion/tasks.md) create (and sometimes destroy) Druid [segments](../design/segments.md). The indexing service has a master/slave like architecture.
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The indexing service is composed of three main components: a [Peon](../design/peons.md) component that can run a single task, a [Middle Manager](../design/middlemanager.md) component that manages Peons, and an [Overlord](../design/overlord.md) component that manages task distribution to MiddleManagers.
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Overlords and MiddleManagers may run on the same process or across multiple processes while MiddleManagers and Peons always run on the same process.
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Tasks are managed using API endpoints on the Overlord service. Please see [Overlord Task API](../operations/api-reference.html#tasks) for more information.
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## Overlord
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See [Overlord](../design/overlord.md).
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## Middle Managers
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See [Middle Manager](../design/middlemanager.md).
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## Peons
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See [Peon](../design/peons.md).
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## Tasks
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See [Tasks](../ingestion/tasks.md).
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