Siyao Meng created HDDS-16441:
---------------------------------
Summary: Cancelled snapshot diff generation publishes an
unreadable DONE report on resubmit
Key: HDDS-16441
URL: https://issues.apache.org/jira/browse/HDDS-16441
Project: Apache Ozone
Issue Type: Bug
Reporter: Siyao Meng
h3. Finding
A cancelled generation's task publishes its result as the new generation's
DONE, so the resubmit path (submitSnapshotDiff, cancelSnapshotDiff,
submitSnapshotDiff) leaves a report the reader cannot read (jobId-prefixed key
mismatch fails the integrity check) and NPEs on read; the job is stuck DONE, is
not client-resubmittable, and the client's legitimately recomputed diff is
discarded, with no recovery until the report-retention TTL GC.
h3. Classification
* Verdict: REPRODUCED
* Severity: Critical
* 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-diff-jobs
Guidance:
campaigns/ozone-9fbf9ee/targets/009-om-snapshot-diff-jobs/.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-diff-jobs|apache/ozone|Java|Use the target-specific
.prompt-extra.md"
{code}
Discovered under HDDS-16430 (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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