[jira] [Created] (HDDS-16442) After OM upgrade, pre-existing DONE snapshot diff jobs are permanently unreadable

["Siyao Meng (Jira)" <ji...@apache.org>]

Siyao Meng created HDDS-16442:
---------------------------------

             Summary: After OM upgrade, pre-existing DONE snapshot diff jobs are permanently unreadable
                 Key: HDDS-16442
                 URL: https://issues.apache.org/jira/browse/HDDS-16442
             Project: Apache Ozone
          Issue Type: Bug
            Reporter: Siyao Meng


h3. Finding
After a routine OM upgrade, every pre-existing DONE snapshot-diff job deserializes with a null largestEntryKey, so the first client read of the report trips the integrity check and hits an uncaught NPE (wrong-key updateJobStatus) instead of the designed retriable error; the report is intact yet permanently unreadable and the job is stuck DONE (not resubmittable) until the retention TTL GC, affecting all old jobs broadly rather than via a rare race.

h3. Classification
* Verdict: REPRODUCED
* Severity: Critical
* Source: Specula TLA+ model checking and confirmation debate, finding CR-2

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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