AIP Recovery

AIP recovery support allows a storage service administrator to replace a corrupt version of a stored AIP with a correct version (restored from a backup, for example).

The AIP recovery process involves copying a recovered version of an AIP into a dedicated recovery directory accessible by the storage service. You can determine the location of this directory by clicking “Locations” in the storage service administration web interface then finding the path assocated with AIP recovery.

Once the recovered version is in place, recovery can be requested via the storage service’s REST interface.

The recovery request must then be approved by an administrator. To get to the recovery request administration page, click “Packages” then “View recovery requests” in the storage service administration web interface. Enter a reason for approval then click “Approve” to start recovery.

How Recovery Works

One an AIP recovery has been approved, the storage service does the following:

  1. Checks the fixity data of the recovered AIP files, failing recovery if the fixity check fails
  2. Copies the corrupt AIP file to a backup directory within the recovery location
  3. Copies the recovered AIP files to AIP storage
  4. Checks the fixity data of the stored AIP, failing recovery if the fixity check fails

Example Recovery command

AIP recovery was designed to be used with Binder. Binder is capable of sending notification to the Storage Service that a replacement AIP is ready for recovery. If you are not using Binder, it is possible to send the notfication using a curl command. Here is an example:

curl --data="event_reason=<description>&pipeline=<pipeline UUID>&user_id=<int>&user_email=<email>" http://127.0.0.1:8000/api/v2/file/<package UUID>/recover_aip/?format=json

In this example, <description, <int> and <email> are to be replaced by information for human use, to relay information from the person making the AIP recovery request to the Storage Service administrator.

Reporting Recovery Progress to External Systems

AIP recovery can be optionally configured to report progress to another system, via a REST POST call, when an AIP recovery has been approved, rejected, or has failed. The information sent includes the ID of the recover request, whether the recovery request was processed successfully, and a text message including the recover request status (“APPROVE” or “REJECT”) and the administrator’s reasoning for the decision.

The following is an example of the JSON sent by this POST call:

{
  "event_id": 127,
  "message": "APPROVE: Request approved, files look good.",
  "success": true
}

To configure the storage service to report AIP restore progress to another system, click “Administration” in the storage service administration web interface and enter a REST endpoint URL into the “Recover request notification url” field.

If the endpoint requires basic authentication, you’ll also need to enter a username and password into the two fields below it. Click “Save” when you’re done.

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