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The Data Service enables the Trifacta® platform to stream metadata and records from JDBC sources for sampling and job execution in the Trifacta Photon running environment. This section describes how to enable and configure the service, including performance tweaks and connection-specific configuration. 

Configure Service

The following basic properties enable the service and specify basic location for it.

You can apply this change through the Admin Settings Page (recommended) or trifacta-conf.json. For more information, see Platform Configuration Methods.

PropertyDescription
"data-service.enabled"

When true, the data service is enabled.

NOTE: When set to false, access to any relational connection is prevented.

Default is true .

"data-service.host"Hostname for the service. Default is localhost.
"data-service.port"

Port number used by the service. Default is 41912 .

NOTE: If you are changing the port number, avoid creating conflicts with existing ports in use. For more information, see System Ports.


"data-service.classpath"The Java class path for the data service.
"data-service.autoRestart"When true, the data service is automatically restarted if it crashes. Default is true .
"data-service.vendorPath"

Path to the vendor configuration files for relational connections. Default value:

%(topOfTree)s/services/data-service/build/conf/vendor

Configure SQL Options  

Configure relational read stream limits

You can apply this change through the Admin Settings Page (recommended) or trifacta-conf.json. For more information, see Platform Configuration Methods.

The Data Service reads data from relational sources in streams of records. You can modify the following parameters to configure the limits of SQL record streaming during read operations. The size of these streams are defined by the following parameters:

"data-service.sqlOptions.maxReadStreamRecords": -1,
"data-service.sqlOptions.limitedReadStreamRecords": 1000000,
"data-service.sqlOptions.initialReadStreamRecords": 25,
"data-service.sqlOptions.hiveReadStreamRecords": 100000000,
PropertyDescription
"data-service.sqlOptions.maxReadStreamRecords"

The maximum number of JDBC records pulled in per stream read during batch execution.

If this value is set to -1, then no limit is applied.

"data-service.sqlOptions.limitedReadStreamRecords"

Max number of records read for the initial sample and quick scan sampling. Setting to -1 means there is no limit.

"data-service.sqlOptions.initialReadStreamRecords"Initial number of records to read for client-side preview and for client-side transform. Set to -1 to apply no limit.
"data-service.sqlOptions.hiveReadStreamRecords"

Max number of records that can be read from Hive, if maxReadStreamRecords is -1.

NOTE: This value cannot be set to -1, which results in a Data Service error. Hive reads must be limited.

Configure Caching

The data service maintains a cache of JDBC objects that have been retrieved for use. You can configure the following properties to tune settings of the cache.

You can apply this change through the Admin Settings Page (recommended) or trifacta-conf.json. For more information, see Platform Configuration Methods.

PropertyDescription
"data-service.cacheOptions.validationDelayMilliseconds"Number of milliseconds to wait between checks validating cached pools. Default is 3600000 (1 hour).
"data-service.cacheOptions.maxSize"

Maximum number of objects in the cache. Default is 100.

NOTE: Set this value to 0 to disable data service caching.

"data-service.cacheOptions.expirySeconds"Objects in the cache that are older than this number of seconds are automatically expired. Default is 86400 (1 day).

Configure for Specific Integrations

Configure Data Service for Hive

The following properties apply to how the platform connects to Hive.

You can apply this change through the Admin Settings Page (recommended) or trifacta-conf.json. For more information, see Platform Configuration Methods.

PropertyDescription
"data-service.hiveManagedTableFormat"Managed table format for your Hive deployment. Default is PARQUET.
"data-service.hiveJdbcJar"Path to the JAR to use for JDBC connectivity to Hive. Default path depends on your Hadoop distribution.

Additional Configuration

The following aspects of the data service can be configured outside of the application: 

  • Connection pool size and retry parameters
  • Vendor field mappings
  • Oracle ciphers for SSL connections
  • JDBC fetch size by vendor

For more information, please contact  Trifacta Customer Success Services.

Logging

For more information on logging for the service, see Configure Logging for Services.

Other Topics

  • If you are reading large datasets from relational sources, you can enable JDBC ingestion, which reads source data in the background and stages on the backend datastore for execution. For more information, see Configure JDBC Ingestion
  • Optionally, SSO authentication can be applied to relational connections. For more information, see Enable SSO for Relational Connections.

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