Siyao Meng created HDDS-16455:
---------------------------------
Summary: Stale scrub task demotes a CLOSED reconstructed EC
replica to UNHEALTHY, forcing SCM re reconstruction
Key: HDDS-16455
URL: https://issues.apache.org/jira/browse/HDDS-16455
Project: Apache Ozone
Issue Type: Bug
Reporter: Siyao Meng
h3. Finding
A stale scrub task silently demotes a successfully-CLOSED reconstructed EC
replica to UNHEALTHY with no ICR; on the next full container report SCM deletes
and re-reconstructs a valid replica. Reachable via the normal scrub background
thread racing the reconstruction/close path; harm is persistent on the datanode
but bounded (SCM re-replicates), so High rather than Critical.
h3. Classification
* Verdict: REPRODUCED
* Severity: High
* 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-ec-reconstruction
Guidance:
campaigns/ozone-9fbf9ee/targets/022-dn-ec-reconstruction/.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
\
"dn-ec-reconstruction|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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