This section details a selection of advanced features of the HDFS driver.
User Defined Views
The driver allows you to define virtual tables, called user defined views, whose contents are decided by a pre-configured query. These views are useful when you cannot directly control queries being issued to the drivers. See User Defined Views for an overview of creating and configuring custom views.
Use SSL Configuration to adjust how driver handles TLS/SSL certificate negotiations. You can choose from various certificate formats; see the SSLServerCert property under "Connection String Options" for more information.
Firewall and Proxy
Configure the driver for compliance with Firewall and Proxy, including Windows proxies and HTTP proxies. You can also set up tunnel connections.
Configure JDBC Remoting to connect to the driver from remote machines. You can choose between remoting via CLI and using a configuration file.
Caching Data enables faster access to data and reduces the number of API calls, improving performance. The connector supports a simple caching model where multiple connections can also share the cache over time. When configuring the cache connection, you can specify automatic or explicit data caching.
The driver offloads as much of the SELECT statement processing as possible to HDFS and then processes the rest of the query in memory (client-side).
See Query Processing for more information.
See Logging for an overview of configuration settings that can be used to refine CData logging. For basic logging, you only need to set two connection properties, but there are numerous features that support more refined logging, where you can select subsets of information to be logged using the LogModules connection property.