Siyao Meng created HDDS-16458:
---------------------------------
Summary: DiskBalancer EC move crash before source delete mark
leaves a permanent orphaned replica
Key: HDDS-16458
URL: https://issues.apache.org/jira/browse/HDDS-16458
Project: Apache Ozone
Issue Type: Bug
Reporter: Siyao Meng
h3. Finding
After a DiskBalancer EC move, a crash (or swallowed mark failure) before the
source is durably marked for delete drops the volatile pending-deletion queue,
and restart reconciliation deliberately leaves both EC copies, producing a
permanent orphaned replica untracked in memory. Triggerable via normal EC moves
plus one crash; harm is a durable disk leak and under-counted volume
accounting, bounded and not client-visible corruption.
h3. Classification
* Verdict: REPRODUCED
* Severity: High
* Source: Specula TLA+ model checking and confirmation debate, finding MC-2
h3. Reproduce
{noformat}
Ozone commit: 9fbf9ee0cb1bd2f5f5d437b6719ebbe5309351fb
Specula: v1.1.0 (commit c6aa3dfa)
Target: dn-disk-balancer
Guidance:
campaigns/ozone-9fbf9ee/targets/021-dn-disk-balancer/.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
\
"dn-disk-balancer|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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