Siyao Meng created HDDS-16464:
---------------------------------
Summary: 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
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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