mirror of https://github.com/apache/druid.git
40 lines
2.2 KiB
Markdown
40 lines
2.2 KiB
Markdown
---
|
|
id: high-availability
|
|
title: "High availability"
|
|
---
|
|
|
|
<!--
|
|
~ Licensed to the Apache Software Foundation (ASF) under one
|
|
~ or more contributor license agreements. See the NOTICE file
|
|
~ distributed with this work for additional information
|
|
~ regarding copyright ownership. The ASF licenses this file
|
|
~ to you under the Apache License, Version 2.0 (the
|
|
~ "License"); you may not use this file except in compliance
|
|
~ with the License. You may obtain a copy of the License at
|
|
~
|
|
~ http://www.apache.org/licenses/LICENSE-2.0
|
|
~
|
|
~ Unless required by applicable law or agreed to in writing,
|
|
~ software distributed under the License is distributed on an
|
|
~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
~ KIND, either express or implied. See the License for the
|
|
~ specific language governing permissions and limitations
|
|
~ under the License.
|
|
-->
|
|
|
|
|
|
Apache ZooKeeper, metadata store, the coordinator, the overlord, and brokers are recommended to set up a high availability environment.
|
|
|
|
- For highly-available ZooKeeper, you will need a cluster of 3 or 5 ZooKeeper nodes.
|
|
We recommend either installing ZooKeeper on its own hardware, or running 3 or 5 Master servers (where overlords or coordinators are running)
|
|
and configuring ZooKeeper on them appropriately. See the [ZooKeeper admin guide](https://zookeeper.apache.org/doc/current/zookeeperAdmin.html) for more details.
|
|
- For highly-available metadata storage, we recommend MySQL or PostgreSQL with replication and failover enabled.
|
|
See [MySQL HA/Scalability Guide](https://dev.mysql.com/doc/mysql-ha-scalability/en/)
|
|
and [PostgreSQL's High Availability, Load Balancing, and Replication](https://www.postgresql.org/docs/9.5/high-availability.html) for MySQL and PostgreSQL, respectively.
|
|
- For highly-available Apache Druid Coordinators and Overlords, we recommend to run multiple servers.
|
|
If they are all configured to use the same ZooKeeper cluster and metadata storage,
|
|
then they will automatically failover between each other as necessary.
|
|
Only one will be active at a time, but inactive servers will redirect to the currently active server.
|
|
- Druid Brokers can be scaled out and all running servers will be active and queryable.
|
|
We recommend placing them behind a load balancer.
|