HetuEngine supports quick joint query of multiple data sources and GUI-based data source configuration and management. You can quickly add a data source on the HSConsole page.

Table 1 lists the data sources supported by HetuEngine of the current version.

**Table 1** List for connecting HetuEngine to data sources
HetuEngine Mode	Data Source	Data Source Mode	Supported Data Source Version
Security mode	Hive	Security mode	MRS 3.x, FusionInsight 6.5.1, and Hive in the current cluster
	HBase		MRS 3.x and FusionInsight 6.5.1
	Elasticsearch		Elasticsearch of the current cluster
	HetuEngine		MRS 3.x
	GaussDB		GaussDB 200 and GaussDB A 8.0.0
	Hudi		MRS 3.1.1 or later
	ClickHouse		MRS 3.1.1 or later
Normal mode	Hive	Normal mode	MRS 3.x, FusionInsight 6.5.1, and Hive in the current cluster
	HBase		MRS 3.x and FusionInsight 6.5.1
	Elasticsearch		Elasticsearch of the current cluster
	Hudi		MRS 3.1.1 or later
	ClickHouse		MRS 3.1.1 or later
	GaussDB	Security mode	GaussDB 200 and GaussDB A 8.0.0

Operations such as adding, configuring, and deleting a HetuEngine data source takes effect dynamically without restarting the cluster.

A configured data source takes effect dynamically and you cannot disable this function. By default, the interval for a data source to dynamically take effect is 60 seconds. You can change the interval to a desired one by changing the value of catalog.scanner-interval in coordinator.config.properties and worker.config.properties by referring to 3.e in Creating HetuEngine Compute Instances. See the following example.

catalog.scanner-interval =120s

The domain name of the data source cluster must be different from that of the HetuEngine cluster. In addition, two data sources with the same domain name cannot be connected to at the same time.
The data source cluster and the HetuEngine cluster can communicate with each other.

Before You Start