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    E-MapReduce:Configure connectors

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    E-MapReduce:Configure connectors

    Last Updated:Mar 26, 2026

    E-MapReduce (EMR) Trino ships with preconfigured built-in connectors and supports adding custom connectors through placeholder connector slots. This topic describes the available built-in connectors, how to modify their configuration, and how to add a custom connector.

    Built-in connectors

    EMR Trino includes the following built-in connectors:

    Connector Description Reference
    Hive Query data in Hive data warehouses. Hive connector
    Kudu Query, insert, and delete data in Kudu. Kudu connector
    MySQL Query tables in an external MySQL instance and create tables. MySQL connector
    Iceberg Query data files in Iceberg format. Iceberg connector
    Hudi Query data in Copy on Write (COW) and Merge on Read (MOR) tables. Hudi connector
    Delta Query data in Delta Lake tables. Delta connector
    JMX Perform system monitoring and debugging. JMX connector
    system Query basic cluster information and metrics. No configuration required — all data is accessible from the system directory. —

    Modify a built-in connector

    Each built-in connector has a dedicated configuration file in the Trino service. The following table maps connectors to their configuration files:

    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

    The following example shows how to modify the Hive connector configuration.

    1. Go to the Trino service page in the EMR console, click the Configure tab, and then click the hive.properties tab.

    2. Modify the configuration items based on your requirements. For details on editing configuration items, see Manage configuration items.

    3. Save the configuration, then choose More > Restart in the upper-right corner of the Services tab.

    The connector becomes available after the service restarts.

    Add a custom connector

    EMR Trino provides five placeholder connector slots — connector1 through connector5 — for adding custom connectors. Each slot has a corresponding configuration file (connector1.properties through connector5.properties). Configuring a placeholder connector follows the same steps as modifying a built-in connector.

    Prerequisites

    Before you begin, ensure that you have:

    • EMR V3.27.0, EMR V4.3.0, EMR V5.2.0, or a later minor version

    Add a custom connector

    To add a custom connector, configure any unoccupied placeholder connector slot.

    The following example adds a MongoDB connector using the connector1 slot.

    1. Go to the Trino service page in the EMR console, click the Configure tab, and then click the connector1.properties tab.

    2. Set connector.name to mongodb.

    3. Add custom configuration items based on your business requirements. For instructions on adding configuration items, see Modify configuration items.

    4. Save the configuration, then choose More > Restart in the upper-right corner of the Services tab.

    The connector becomes available after the service restarts.