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# Groot Stream Config
The purpose of this file is to provide a global configuration for the groot-stream server, such as the default configuration of the job.
## Config file structure
```yaml
grootstream:
knowledge_base: # Define the libraries
- name: ${knowledge_base_name}
fs_type: ${file_system_type}
fs_path: ${file_system_path}
files:
- ${file_name} # Define the file name of the knowledge base.
properties: # Custom parameters.
hos.path: ${hos_path}
hos.bucket.name.traffic_file: ${traffic_file_bucket}
hos.bucket.name.troubleshooting_file: ${troubleshooting_file_bucket}
scheduler.knowledge_base.update.interval.minutes: ${knowledge_base_update_interval_minutes} # Define the interval of the knowledge base file update.
```
### Knowledge Base
The knowledge base is a collection of libraries that can be used in the groot-stream job's UDFs. File system type can be specified `local` or `http` mode. If the value is `http`, must be `KB Repository` URL. The library will be dynamically updated according to the `scheduler.knowledge_base.update.interval.minutes` configuration.
| Name | Type | Required | Default | Description |
|:---------|:--------|:---------|:--------|:---------------------------------------------------------------------------|
| name | String | Yes | - | The name of the knowledge base, used to [UDF](processor/udf.md) |
| fs_type | String | Yes | - | The type of the file system. Enum: local and http. |
| fs_path | String | Yes | - | The path of the file system. It can be file directory or http restful api. |
| files | Array | No | - | The file list of the knowledge base object. |
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