Siyao Meng created HDDS-16461:
---------------------------------
Summary: Asymmetric decrement inflates persisted
pendingDeleteBlockCount (masked by restart reset)
Key: HDDS-16461
URL: https://issues.apache.org/jira/browse/HDDS-16461
Project: Apache Ozone
Issue Type: Bug
Reporter: Siyao Meng
h3. Finding
An asymmetric decrement in the V2/V3 block-deletion path leaves the persisted
pendingDeleteBlockCount inflated on a fully drained container (an internal
invariant violation reachable via the real mark path plus one background
deletion pass when a block is processed more times than it is unlinked, e.g.
duplicate txns per HDDS-11267 or SCM at-least-once redelivery). No live
consumer reads the persisted value while the DN runs; the only activation path
(restart reload) is masked by resetPendingDeleteBlockCount (HDDS-7156), which
converts the divergence into one wasted deletion pass and a log line rather
than external corruption.
h3. Classification
* Verdict: MASKED
* Severity: Medium
* Source: Specula TLA+ model checking and confirmation debate, finding MC-1
h3. Reproduce
{noformat}
Ozone commit: 9fbf9ee0cb1bd2f5f5d437b6719ebbe5309351fb
Specula: v1.1.0 (commit c6aa3dfa)
Target: dn-block-deletion
Guidance:
campaigns/ozone-9fbf9ee/targets/017-dn-block-deletion/.prompt-extra.md
{noformat}
{code:none}
specula run --agent=claude-code --effort=medium --keep-original
--max-parallel=2 \
--enable-reviews --confirm-debate --tlc-memory-limit=28G --tlc-worker-limit=8
\
"dn-block-deletion|apache/ozone|Java|Use the target-specific .prompt-extra.md"
{code}
Discovered under HDDS-16433 (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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