Troubleshooting Lineage V3 Migration

Applies from version 2021.4

If the lineage migration failed, check if it is at the stage where it already enabled Lineage V3 and contact Alation Support.

Checking the Lineage V3 Status

You can check if Lineage V3 is enabled or disabled using the alation_conf feature flag lineage-service.enabled. To check the state of this flag, from the Alation shell, run:

alation_conf lineage-service.enabled

The values can be:

  • True: Lineage V3 enabled

  • False: Lineage V3 disabled

Alation does not recommend changing the value of this parameter manually.

Lineage Service Logs

There are two log files in the logs directory at /opt/alation/site/logs/ that are associated with the lineage service:

  • lineage.log: Contains information about the service health and general logging statements for both read and write pipelines.

  • lineage_error.log: Logs all errors that occur in the Lineage service, for example, errors related to writing to or retrieval from the Event Bus, errors in lineage processing, request process or database access.

In addition to these two dedicated log files, some other log files on are also relevant to the lineage service:

  • alation-info.log

  • alation-debug.log

  • celery-default.log

  • celery-default_error.log

If you find issues with displaying lineage data after the migration, check the celery-default_error.log for specific errors.

Changing the Lineage Logging Level

The lineage logs can be written in two modes: info or debug. The default is info. You can set it to debug in order to capture a more detailed log. To change the log level:

  1. From the Alation shell, run:

    alation_conf -s debug lineage-service.logger.level

  2. Restart the lineage service:

    alation_supervisor restart lineage

In order to return to the info log level:

  1. From the Alation shell, run:

    alation_conf -s info lineage-service.logger.level

  2. Restart the lineage service:

    alation_supervisor restart lineage

Lineage Service Status

To check the status of the Lineage service, from the Alation shell, run:

alation_supervisor status lineage

Event Bus Status

To check the status of Event Bus, from the Alation shell, run:

alation_supervisor status event-bus:*

Both the Lineage service and Event Bus must be in the Running state for Lineage V3 to function correctly.