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Update 2.meta-service.md #622

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# Meta Service

This article will introduce the architecture and functions of the Meta Service.
This topic introduces the architecture and functions of the Meta Service.

## The architecture of the Meta Service

The architecture of the Meta Service is as follows:

![The architecture of the Meta Service](https://docs-cdn.nebula-graph.com.cn/docs-2.0/1.introduction/2.nebula-graph-architecture/meta-architecture1.png)

The Meta Service is run by the nebula-metad processes. Users can deploy nebula-metad processes according to the scenario:
The Meta Service is run by nebula-metad processes. Users can deploy nebula-metad processes according to the scenario:

* In a test environment, users can deploy one or three nebula-metad processes on different machines or a single machine.
* In a production environment, we recommend that users deploy three nebula-metad processes on different machines for high availability.
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