5.21. Thrift Connector

In order to use the Thrift connector with an external system, you need to implementthe interface, found below. Next, you configure the Thrift connectorto point to a set of machines, called Thrift servers, that implement the interface.As part of the interface implementation, the Thrift servers will provide metadata,splits and data. The connector will randomly choose a server to talk to from the availableinstances for metadata calls, or for data calls unless the splits include a list of addresses.All requests are assumed to be idempotent and can be retried freely among any server.

To configure the Thrift connector, create a catalog properties fileetc/catalog/thrift.properties with the following content,replacing the properties as appropriate:

You can have as many catalogs as you need, so if you have additionalThrift systems to connect to, simply add another properties file to etc/catalogwith a different name (making sure it ends in .properties).

Comma-separated list of thrift servers in the form of host:port. For example:

This property is required; there is no default.

Maximum size of a data response that the connector accepts. This value is sentby the connector to the Thrift server when requesting data, allowing it to sizethe response appropriately.

Number of refresh threads for metadata cache.

This property is optional; the default is 1.

The following IDL describes the that must be implemented: