Page History

...

1. Start copying of each partition file (including index) to the target directory with the re-encryption. These files will have dirty data due to concurrent checkpoint thread writes.
2. Collect all dirty pages related to ongoing checkpoint process and corresponding partition files and apply them (with re-encryption) to the copied file right after the copy process ends.
3. When local re-encryption of all required cache groups completes - send message that this phase is finished on this node (in other words, distributed process "prepare" is finished on local node).
4. Continue to collect and apply dirty pages encrypted with the new key to copied partition until "finish" phase is started.

...