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Version: 1.22.0

Manage metadata changes

Once you have connected your metastores, manage how metadata changes are detected by selecting a preferred operation mode when editing a metastore agent.

ModeDescription
Listening (Default)Listen for changes in real time if supported by your source environment.
ScanningPeriodically scan source metadata for changes.

If your source environment is not configured to use Listeners, LiveData Migrator uses Scanning as the preferred operation mode.

If your source environment version isn't supported for Hive Migrator Listening mode, configure your source metastore agent to use Scanning as the preferred operation mode.

Configure your source metastore agent to use Scanning as the preferred operation mode if your source environment generates low or insufficient volumes of notifications from the events stream.

Listening mode requirements

info

Listening mode is supported for HDP 3.1.5 and CDP 7.1.x. See HVM listener event type limitations for more information. Users for any Hadoop version other than HDP 3.1.5 or CDP 7.1.x must select Scanning mode. For information on other Hadoop versions, contact support.

To enable Listening mode, you must have:

Enable listeners

Listeners are enabled by default in HDP 3.1.5 and CDP 7.1.x.

You can confirm that listeners are enabled for an agent using the hive agent check command.

If enabled, the response will show listenersEnabled: "true".