Siyao Meng created HDDS-16452:
---------------------------------
Summary: Inter SCM checkpoint served during an apply window ships
data ahead of the durable index, diverging replicas
Key: HDDS-16452
URL: https://issues.apache.org/jira/browse/HDDS-16452
Project: Apache Ozone
Issue Type: Bug
Reporter: Siyao Meng
h3. Finding
A checkpoint served by InterSCMGrpcService.download during an apply window
ships data at index i under stale durable index i-1; a follower installs it and
durably holds data ahead of its recorded index (CheckpointConsistent violated
across replicas), then re-applies the entry on catch-up. Reproduced through the
real concurrent apply/download APIs on a real store. For non-idempotent SCM
transactions (e.g. deleted-block accounting, corroborated by a separate tracked
issue) this diverges across SCM replicas with no automatic recovery; idempotent
transactions self-heal via replay.
h3. Classification
* Verdict: REPRODUCED
* Severity: Critical
* Source: Specula TLA+ model checking and confirmation debate, finding MC-2
h3. Reproduce
{noformat}
Ozone commit: 9fbf9ee0cb1bd2f5f5d437b6719ebbe5309351fb
Specula: v1.1.0 (commit c6aa3dfa)
Target: scm-ha-tx-buffer
Guidance:
campaigns/ozone-9fbf9ee/targets/018-scm-ha-tx-buffer/.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
\
"scm-ha-tx-buffer|apache/ozone|Java|Use the target-specific .prompt-extra.md"
{code}
Discovered under HDDS-16432 (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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