[HDDS-11528] [snapshot] Exclusive size of snapshot is always showing 0

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Snapshot
• Labels: ozone-snapshot
• Assignee: Unassigned
• Reporter: Jyotirmoy Sinha
• Created: 04/Oct/24 06:45
• Updated: 04/Oct/24 06:46

Description

Exclusive size of snapshot is always showing 0

Scenario :

• Key size - 1MB
• Create snap0 - empty
• Create snap1 - key1
• Create snap2 - key1
• Create snap3 - key1, key2
• Create snap4 - key1, key2(renamed)
• Create snap5 - key1 [key2 deleted]
• Delete snap2 and snap4
• Create snap6 - key1, key3
• Create snap7 - key1 [key3 deleted] 
• Check exclusive size of snap6 - its reflected as 0, although it exclusively holds key3
• Check exclusive size of snap3 - its reflected as 0, although it exclusively holds key2, , since other snapshot which hold key2 are deleted - snap4

Snapshot info of snap3 -

# ozone sh snapshot info vol-n1fu0/buck-tin1a snap-ton6m
{
  "volumeName" : "vol-n1fu0",
  "bucketName" : "buck-tin1a",
  "name" : "snap-ton6m",
  "creationTime" : 1727997314792,
  "snapshotStatus" : "SNAPSHOT_ACTIVE",
  "snapshotId" : "0b731ad8-e256-42c1-9fdc-2a3ae22dedbc",
  "snapshotPath" : "vol-n1fu0/buck-tin1a",
  "checkpointDir" : "-0b731ad8-e256-42c1-9fdc-2a3ae22dedbc",
  "referencedSize" : 362807296,
  "referencedReplicatedSize" : 1088421888,
  "exclusiveSize" : 0,
  "exclusiveReplicatedSize" : 0
} 

Snapshot info of snap6 -

# ozone sh snapshot info vol-n1fu0/buck-tin1a snap-8barh
{
  "volumeName" : "vol-n1fu0",
  "bucketName" : "buck-tin1a",
  "name" : "snap-8barh",
  "creationTime" : 1727997400069,
  "snapshotStatus" : "SNAPSHOT_ACTIVE",
  "snapshotId" : "ddf4e855-c3fb-4026-8a42-6dfe73bfd858",
  "snapshotPath" : "vol-n1fu0/buck-tin1a",
  "checkpointDir" : "-ddf4e855-c3fb-4026-8a42-6dfe73bfd858",
  "referencedSize" : 362807296,
  "referencedReplicatedSize" : 1088421888,
  "exclusiveSize" : 0,
  "exclusiveReplicatedSize" : 0
} 

All snapshot contents -

# ozone fs -ls -R ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot
drwxrwxrwx   - hrt_qa hrt_qa          0 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-34qcr
drwxrwxrwx   - hrt_qa hrt_qa  362807296 2024-10-03 23:16 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-8barh
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-8barh/key_1727997247
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:16 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-8barh/key_1727997378
drwxrwxrwx   - hrt_qa hrt_qa  181403648 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-bz1a9
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-bz1a9/key_1727997247
drwxrwxrwx   - hrt_qa hrt_qa  362807296 2024-10-03 23:15 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-ton6m
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-ton6m/key_1727997247
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:15 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-ton6m/key_1727997298
drwxrwxrwx   - hrt_qa hrt_qa  181403648 2024-10-03 23:15 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-vsiih
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-vsiih/key_1727997247
drwxrwxrwx   - hrt_qa hrt_qa  181403648 2024-10-03 23:16 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-wk1to
-rw-rw-rw-   3 hrt_qa om      181403648 2024-10-03 23:14 ofs://ozone1727943432/vol-n1fu0/buck-tin1a/.snapshot/snap-wk1to/key_1727997247