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https://issues.apache.org/jira/browse/HDDS-15187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang reassigned HDDS-15187:
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Assignee: Wei-Chiu Chuang
> Enable ozone.snapshot.deep.cleaning.enabled by default
> ------------------------------------------------------
>
> Key: HDDS-15187
> URL: https://issues.apache.org/jira/browse/HDDS-15187
> Project: Apache Ozone
> Issue Type: Task
> Components: Snapshot
> Affects Versions: 2.2.0
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Blocker
>
> h1. Symptoms
> Files marked for deletion are never marked reclaimable because when a
> snapshot is deleted, its contents are appended to the next Active snapshot.
> Because there is always an Active snapshot remaining when a snapshot is
> deleted, the files marked for deletion will be kept with the current Active
> snapshots perpetually. We can see this mechanism at work in the Ozone Manager
> role logs (/var/log/hadoop-ozone/ozone-om.log by default) where log messages
> specify “entries will be moved to next active snapshot”:
> {noformat}
> 2026-04-14 22:21:02,311 INFO
> [SnapshotDeletingService#0]-org.apache.hadoop.ozone.om.service.SnapshotDeletingService:
> Started Snapshot Deletion Processing for snapshot :
> /snaptest1/snapbucket1/s20260414-212019.561
> 2026-04-14 22:21:02,312 INFO
> [SnapshotDeletingService#0]-org.apache.hadoop.ozone.om.service.SnapshotDeletingService:
> Snapshot: /snaptest1/snapbucket1/s20260414-212019.561 entries will be moved
> to next active snapshot: /snaptest1/snapbucket1/s20260414-214018.921
> {noformat}
> h1. Proposed solution
> The Ozone Snapshot GC project (HDDS-12558) refactored Ozone Snapshot
> implementation. HDDS-11411 added a configuration property
> ozone.snapshot.deep.cleaning.enabled which moves deleted keys from AOS or
> deleted snapshot to the next snapshot. But this flag is false by default.
> We need to enable this flag by default to prevent orphaned files accumulating
> in the cluster.
> h1. Workaround
> Set ozone.snapshot.deep.cleaning.enabled=true in the Ozone Manager's
> ozone-site.xml.
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