[HDDS-9428] [snapshot] Exclusive size not populated properly when an intermediate snapshot is deleted in a chain

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Snapshot
• Labels: ozone-snapshot
• Assignee: Aswin Shakil
• Reporter: Jyotirmoy Sinha
• Created: 11/Oct/23 07:16
• Updated: 01/Nov/23 21:00

Description

Steps :

1. Create vol/buck and key
2. Create snapshot snap1
3. Create snapshot snap2
4. Delete key 
5. Delete snapshot snap2
6. Create snapshot snap3 before the snap2 is reclaimed
7. Check exclusiveSize of all snapshots

Expected behaviour - exclusiveSize of snap1 should be the size of the key, since the key is now only held by that snapshot.

Observed behaviour - exclusiveSize of snap1 is 0

Snapshot contents -

# ozone fs -ls -R ofs://ozone1/vol1/buck1/.snapshot
drwxrwxrwx   - om om        668 2023-10-11 06:43 ofs://ozone1/vol1/buck1/.snapshot/snap1
-rw-rw-rw-   3 om om        668 2023-10-11 06:43 ofs://ozone1/vol1/buck1/.snapshot/snap1/key1
drwxrwxrwx   - om om          0 2023-10-11 07:10 ofs://ozone1/vol1/buck1/.snapshot/snap3 

Snapshot details -

# ozone sh snapshot ls vol1/buck1
[ {
  "volumeName" : "vol1",
  "bucketName" : "buck1",
  "name" : "snap1",
  "creationTime" : 1697006634077,
  "snapshotStatus" : "SNAPSHOT_ACTIVE",
  "snapshotId" : "48ffa4d2-1751-42e5-a7be-62a6f28cadfa",
  "snapshotPath" : "vol1/buck1",
  "checkpointDir" : "-48ffa4d2-1751-42e5-a7be-62a6f28cadfa",
  "referencedSize" : 668,
  "referencedReplicatedSize" : 2004,
  "exclusiveSize" : 0,
  "exclusiveReplicatedSize" : 0
}, {
  "volumeName" : "vol1",
  "bucketName" : "buck1",
  "name" : "snap3",
  "creationTime" : 1697008218140,
  "snapshotStatus" : "SNAPSHOT_ACTIVE",
  "snapshotId" : "9e2e0a52-090c-4afe-8b4c-6288078731e2",
  "snapshotPath" : "vol1/buck1",
  "checkpointDir" : "-9e2e0a52-090c-4afe-8b4c-6288078731e2",
  "referencedSize" : 0,
  "referencedReplicatedSize" : 0,
  "exclusiveSize" : 0,
  "exclusiveReplicatedSize" : 0
} ]