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https://issues.apache.org/jira/browse/HDDS-16464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siyao Meng updated HDDS-16464:
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Attachment: HDDS-16464.001.patch
> Unfenced deep clean flag write strands a snapshot's reclaimable deleted keys
> for its retention
> ----------------------------------------------------------------------------------------------
>
> Key: HDDS-16464
> URL: https://issues.apache.org/jira/browse/HDDS-16464
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Siyao Meng
> Priority: Major
> Attachments: HDDS-16464.001.patch
>
>
> h3. Finding
> Internal invariant violation (DeepCleanedImpliesDrained) that demonstrably
> propagates to an external effect: an unfenced deep-clean-flag write clobbers
> the purge-driven reset, so the snapshot is skipped by every future
> KeyDeletingService run and its now-reclaimable deleted keys are stranded for
> the snapshot's entire retention (space leak, understated exclusive-size
> accounting). Triggerable from ordinary key delete plus snapshot create/delete
> GC activity; harm is bounded (no data loss, no premature reclaim) and only
> escapes when the snapshot is itself deleted, so High rather than Critical.
> h3. Classification
> * Verdict: REPRODUCED
> * Severity: High
> * Source: Specula TLA+ model checking and confirmation debate, finding MC-1
> h3. Reproduce
> {noformat}
> Ozone commit: 9fbf9ee0cb1bd2f5f5d437b6719ebbe5309351fb
> Specula: v1.1.0 (commit c6aa3dfa)
> Target: om-snapshot-gc
> Guidance:
> campaigns/ozone-9fbf9ee/targets/008-om-snapshot-gc/.prompt-extra.md
> {noformat}
> {code:none}
> specula run --agent=claude-code --effort=high --keep-original
> --max-parallel=2 \
> --enable-reviews --confirm-debate --tlc-memory-limit=28G
> --tlc-worker-limit=8 \
> "om-snapshot-gc|apache/ozone|Java|Use the target-specific .prompt-extra.md"
> {code}
> Discovered under HDDS-15927 (Specula TLA+ verification effort). The TLA+
> specification, counterexample, and confirmation debate live in the Specula
> run artifacts.
> Generated with Specula (Claude Opus 4.8).
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