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https://issues.apache.org/jira/browse/HDDS-16452?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siyao Meng updated HDDS-16452:
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Attachment: HDDS-16452.001.patch
> 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
> Priority: Critical
> Attachments: HDDS-16452.001.patch
>
>
> 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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