Source: https://dev-docs.nebula-graph.io/v5.3.2/utilities/exchange/config/sources/nebula3/
Documentation version: v5.3.2

# NebulaGraph 3.x configurations

This topic introduces the configuration options for importing data from a NebulaGraph 3.x data source. For information about the complete configuration file and options, see [Data import configurations](https://dev-docs.nebula-graph.io/v5.3.2/utilities/exchange/config/).

## Data source configurations

The following table lists the configuration options specific to the NebulaGraph 3.x data source.

 | Option | Description | Type | Required | Default value
 | `type` | The type of the data source. In this case, set the value to `"nebula3"`. | String | Yes | N/A
 | `metaAddress` | The address and port of the Meta service. | String | Yes | N/A
 | `user` | The username of the Meta service. | String | No | N/A
 | `password` | The current password for the account used to connect to the source instance. | String | No | N/A
 | `spaceName` | The name of the graph space from which data is retrieved. | String | Yes | N/A
 | `labelName` | The name of the tag or edge type from which data is retrieved. | String | Yes | N/A
 | `returnColumns` | The list of names of properties from which data is retrieved. If not specified, the value of `sourceFields` set in [node mapping configurations](https://dev-docs.nebula-graph.io/v5.3.2/utilities/exchange/config/sources/mapping/#node_mapping_configurations) or [edge mapping configurations](https://dev-docs.nebula-graph.io/v5.3.2/utilities/exchange/config/sources/mapping/#edge_mapping_configurations) is used. | List | No | null
 | `fetchSize` | The number of vertexes or edges to fetch in each read request. | Int | No | `1000`

## Common source configurations

The following configuration options can also be specified as global settings in the section `sourcesCommon` of the configuration file:

- `type`
- `metaAddress`
- `user`
- `password`
- `spaceName`
- `fetchSize`

Note that the configurations on specific data sources override the global settings.

## Data source configuration example

Replace `<source-password>` and `<current-password>` with the current passwords for the source and target accounts, respectively. If a password has changed, use the new password.

NebulaGraph 3.x source configurations

````
sources: [
  {
      type:"nebula3"
      metaAddress: "192.168.15.2:9559"
      user: root
      password: "<source-password>"
      spaceName: movie 
      labelName: person
      returnColumns: [people_id,name]
      fetchSize: 20
//      nodetypes: []
//      edgetypes: []
  }
]  

````

## Complete configuration example

````
{
  taskType: import
  nebula: {
    graphAddr: "127.0.0.1:9669"
    graphName: "movie"
    user: "root"
    passwd: "<current-password>"
  }

  error: {
    path: "/tmp/errors"
    maxRecords: 10000
  }

  checkPoint: {
    path: "/tmp/checkpoint"
    resume: false
  } 

  sourcesCommon:{
    type:"nebula3"
    metaAddress: "192.168.15.2:9559"
    user: root
    password: "<source-password>"
    spaceName: movie
    fetchSize: 1000
  }

  writeCommon:{
    batchSize: 2000
    enableRealTimeQPSLog: true
    mode: "INSERT IGNORE"
  }

  sources: [
    # node type Actor
    {
      labelName: actor
      pre_processes: {
          filter: ["birth_date!='\\N'"]
          concatConstant: [
            {
              field: "name"
              prefixValue: "test_"
              suffixValue: ""
            }
          ]
      }

      nodetypes: [
        {
          name: "Actor"
          sourceFields: [people_id,name,birth_date]
          nebulaFields: [id,name,birthDate]
        }
      ]
    }

    # node type Movie
    {
      labelName: movie
      nodetypes: [
        {
          name: "Movie"
          sourceFields: [movie_id,name]
          nebulaFields: [id,name]
        }
      ]
    }

   # edge type Act
    {
      labelName: act
      edgetypes: [
        {
          name: "Act"
          sourceKeys: [people_id]
          nebulaSrcKeys: [id]
          targetKeys: [movie_id]
          nebulaDstKeys: [id]
          sourceFields: []
          nebulaFields: []
        }
      ]
    }

  ]
}

````