Disconnected Mode

After a Transformer is registered with Control Hub, Control Hub authenticates and authorizes user access to the Transformer. As a result, the Transformer communicates with Control Hub at regular intervals - around every 30 seconds or less. When a Transformer cannot connect to Control Hub, due to a network or system outage, then the Transformer uses the Control Hub disconnected mode.

During normal operations when the Transformer can connect to Control Hub, Control Hub notifies the Transformer when there is a change to the users of the organization that the Transformer belongs to. Control Hub sends a credentials file to all Transformers in that organization. The credentials file contains all the user names and corresponding passwords and roles for all active users in the organization. The user names and passwords are securely hashed in the credentials file. Each time this user information changes, Control Hub sends an updated file to all the Transformers.

If the Transformer cannot reach Control Hub due to a network or system outage, the Transformer switches to disconnected mode and uses the last received credentials file to authenticate and authorize users.

When a Transformer runs in disconnected mode, users can still log in to the Transformer based on the type of authentication configured for the Control Hub organization:

Control Hub authentication: If an organization uses Control Hub authentication, users can use their Control Hub credentials to log in to and use a Transformer in disconnected mode.
SAML authentication: If an organization uses SAML authentication, users cannot use their SAML credentials to log in to a Transformer in disconnected mode. Only organization administrators can use their Control Hub credentials to log in.

After logging into a Transformer in disconnected mode, you cannot publish pipelines to Control Hub, view pipeline commit history, or download published pipelines from Control Hub. When the Transformer can connect to Control Hub again, it switches back to the Control Hub enabled mode. Then you can continue to manage how pipelines work with Control Hub.

If a Transformer switches to disconnected mode while you are logged in, Transformer requires that you log in again with your Control Hub user account. After you log in, the following Disconnected Mode icon displays: