aswinshakil opened a new pull request, #4244:
URL: https://github.com/apache/ozone/pull/4244

   ## What changes were proposed in this pull request?
   
   The patch implements `SnapshotDeletingService`, it goes through the deleted 
snapshot's `deletedTable` and does either of the following.
   
   1. Move it to the next non-deleted snapshot, if there is none move it to 
active object store DB.
   2. Or Move it to the active object store DB.
   
   ## Follow-up TODO
   Right now the `SnapshotDeletingService` doesn't handle the following and 
will be done in the next patch. 
   Tracked here: [HDDS-7883](https://issues.apache.org/jira/browse/HDDS-7883)
   
   1. Handle the cleanup of renamed keys between snapshots.
   2. To accommodate keys from FSO buckets. 
   3. Cleaning up SnapshotChain, Checkpoint directory. `OMSnapshotPurgeRequest` 
will do these cleanups. 
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-7740
   
   ## How was this patch tested?
   
   The patch was tested with UTs and manual testing. 
   


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