Siyao Meng created HDDS-16428:
---------------------------------
Summary: Formal verification for Ozone OM read consistency
(follower reads and hsync lease commit) with TLA+
Key: HDDS-16428
URL: https://issues.apache.org/jira/browse/HDDS-16428
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Siyao Meng
Use TLA+ (via the Specula pipeline) to model and verify OM read consistency:
follower read visibility under LINEARIZABLE and LINEARIZABLE_ALLOW_FOLLOWER,
and the hsync lease commit path. Model check the specification and validate
real OM traces against it. Bugs found by this effort are linked under this
issue.
h3. Run environment
{noformat}
Ozone commit: 9fbf9ee0cb1bd2f5f5d437b6719ebbe5309351fb
Specula: v1.1.0 (commit c6aa3dfa)
Agent/model: claude-code, Claude Opus 4.8 (1M context)
{noformat}
h3. Coverage
||Target||Effort||Guidance||Result||
|om-follower-read|high|{{campaigns/ozone-9fbf9ee/targets/001-om-follower-read/.prompt-extra.md}}|3
findings, all ENV_LIMITED High (BUG_FOLLOWER_READ)|
|om-hsync-lease-commit|high|{{campaigns/ozone-9fbf9ee/targets/003-om-hsync-lease-commit/.prompt-extra.md}}|No
findings|
h3. Reproduce
{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
\
"<target>|apache/ozone|Java|Use the target-specific .prompt-extra.md"
{code}
h3. Bugs (link via "Testing discovered")
* (ENV_LIMITED, High) BUG_FOLLOWER_READ: under LINEARIZABLE_ALLOW_FOLLOWER a
read served by a superseded leader can return stale local state. Three related
model checking findings (MC-1, MC-2, CR-2) share this root cause; reachable
only in the allow-follower read configuration, so env-limited rather than
reproduced.
Generated with Specula (Claude Opus 4.8).
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