System and method for selective storage transformation

1. A method comprising:

obtaining specified comparison predicates to restrict a set of objects in a storage container to transform;

creating a transformation job associated with the storage container, the transformation job creation including turning the specified comparison predicates into a composite filter;

performing a transformation service for the created transformation job, the transformation service performance including enumerating content of the storage container and applying the composite filter to each found object; and

adding one or more objects that are determined to pass the composite filter to an object index of a primary storage, wherein during performance of the transformation service, the primary storage assures co-existence of the primary storage and the storage container to transform.

2. The method of claim 1 wherein assuring co-existence of the primary storage and the storage container to transform comprises redirecting a request from a data client, which the primary storage cannot handle, to the storage container under transformation.

3. The method of claim 2 wherein the redirected request is an update request for a non-transformed object, and the method further comprises:

reading metadata of the non-transformed object and applying the composite filter to the object; and

adding the object to the object index of the primary storage if the object passes the composite filter.

4. The method of claim 1 wherein in a case where an object is determined to not pass the composite filter because the specified comparison predicate for the object has expired after the transformation job has started and before the transformation job has finished, and the comparison predicate for the object is subsequently reinstated, the transformation service adds the object to the object index of the primary storage.

5. A data processing system comprising:

electronic hardware circuitry constructed to:

obtain specified comparison predicates to restrict a set of objects in a storage container to transform;

create a transformation job associated with the storage container, the transformation job creation including turning the specified comparison predicates into a composite filter;

perform a transformation service for the created transformation job, the transformation service performance including enumerating content of the storage container and applying the composite filter to each found object; and

add one or more objects that are determined to pass the composite filter to an object index of a primary storage, wherein during performance of the transformation service, the primary storage assures co-existence of the primary storage and the storage container to transform.

6. The data processing system of claim 5 wherein assuring co-existence of the primary storage and the storage container to transform comprises redirecting a request from a data client, which the primary storage cannot handle, to the storage container under transformation.

7. The data processing system of claim 6 wherein the redirected request is an update request for a non-transformed object, and the electronic hardware circuitry is further constructed to:

read metadata of the non-transformed object and apply the composite filter to the object; and

add the object to the object index of the primary storage if the object passes the composite filter.

8. The data processing system of claim 5 wherein in a case where an object is determined to not pass the composite filter because the specified comparison predicate for the object has expired after the transformation job has started and before the transformation job has finished, and the comparison predicate for the object is subsequently reinstated, the transformation service adds the object to the object index of the primary storage.

9. A non-transitory computer-readable storage medium storing computer-executable instructions, the instructions causing a machine to execute a process comprising:

obtaining specified comparison predicates to restrict a set of objects in a storage container to transform;

creating a transformation job associated with the storage container, the transformation job creation including turning the specified comparison predicates into a composite filter;

performing a transformation service for the created transformation job, the transformation service performance including enumerating content of the storage container and applying the composite filter to each found object; and

adding one or more objects that are determined to pass the composite filter to an object index of a primary storage, wherein during performance of the transformation service, the primary storage assures co-existence of the primary storage and the storage container to transform.

10. The non-transitory computer-readable storage medium of claim 9 wherein assuring co-existence of the primary storage and the storage container to transform comprises redirecting a request from a data client, which the primary storage cannot handle, to the storage container under transformation.

11. The non-transitory computer-readable storage medium of claim 10 wherein the redirected request is an update request for a non-transformed object, and the electronic hardware circuitry is further constructed to:

read metadata of the non-transformed object and apply the composite filter to the object; and

add the object to the object index of the primary storage if the object passes the composite filter.

12. The non-transitory computer-readable storage medium of claim 9 wherein in a case where an object is determined to not pass the composite filter because the specified comparison predicate for the object has expired after the transformation job has started and before the transformation job has finished, and the comparison predicate for the object is subsequently reinstated, the transformation service adds the object to the object index of the primary storage.