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    E-MapReduce:Configure connectors

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    E-MapReduce:Configure connectors

    Last Updated:Jul 17, 2026

    E-MapReduce (EMR) provides built-in Trino connectors that you can modify or extend with custom connectors.

    Built-in Trino connectors in EMR

    EMR Trino includes the following built-in connectors.

    Connector

    Description

    References

    Hive

    The Hive connector lets you query data in a Hive data warehouse.

    Hive connector

    Kudu

    The Kudu connector lets you query, insert, and delete data in Kudu.

    Kudu connector

    MySQL

    The MySQL connector lets you query and create tables in an external MySQL instance.

    MySQL connector

    Iceberg

    The Iceberg connector lets you query data files in Iceberg format.

    Iceberg connector

    Hudi

    The Hudi connector lets you query Copy on Write (COW) and Merge on Read (MOR) tables.

    Hudi connector

    Delta

    The Delta connector lets you query Delta Lake tables.

    Delta connector

    JMX

    The JMX connector enables system monitoring and debugging.

    JMX connector

    system

    The system connector lets you query cluster information and metrics.

    Note

    The system connector requires no configuration. All information is available through the system catalog.

    None

    Modify a built-in connector

    You can modify the configuration file for each connector on the Configure tab of the Trino service in the EMR console. The following table maps each connector to its configuration file.

    Connector

    Configuration file

    Hive

    hive.properties

    Kudu

    kudu.properties

    MySQL

    mysql.properties

    Iceberg

    iceberg.properties

    Hudi

    hudi.properties

    Delta

    delta.properties

    JMX

    jmx.properties

    system

    system.properties

    Example: Modify the Hive connector

    1. On the Configure tab for the Trino service in the EMR console, in the Service Configuration section, click the hive.properties tab.

    2. Modify the configuration items as needed.

      See Manage configuration items for details.

    3. After saving the configuration, select More > Restart in the upper-right corner.

      Note

      After the service restarts, the connector is ready to use.

    Add a custom connector

    Note

    This feature is available only in EMR V3.27.0, V4.3.0, V5.2.0, and later versions.

    By default, EMR Trino provides five placeholder connectors for custom use: connector1 through connector5. These correspond to the connector1.properties, connector2.properties, connector3.properties, connector4.properties, and connector5.properties files on the Configure tab of the Trino service. The configuration process is the same as for built-in connectors.

    To add a custom connector, modify the configuration of an unused placeholder connector.

    Example: Add a MongoDB connector

    1. On the Configure tab for the Trino service in the EMR console, in the Service Configuration section, click the connector1.properties tab.

    2. Set connector.name to mongodb.

    3. Add custom configuration items as needed.

      See Modify configuration items for details.

    4. After saving the configuration, select More > Restart in the upper-right corner.

      Note

      After the service restarts, the connector is ready to use.