# Release 0.5.2 Status Summary

**Date:** December 4, 2024  
**Status:** ❌ BLOCKED - CI/Test Failures

---

## Current Situation

Both GitHub Actions workflows (ci.yml and test.yml) are failing on the latest commit (`0b10a6f`) with Rust compilation errors in the JIT module.

### Failed Workflows
- **CI Workflow:** Run #99 - Failed at 21:59 UTC
- **Test Workflow:** Run #119 - Failed at 21:59 UTC
- **Branch:** `main`
- **Commit:** `0b10a6f24d00227e5e2a3a00a64df754cdbb8b08`

---

## Root Cause

The experimental **JIT compilation** feature (`src/algorithms/steps/loop_step.rs`) has thread-safety issues:

1. **Sync Trait Violation:**
   - `LoopStep` struct requires `Send + Sync` to implement the `Step` trait
   - Contains `Mutex<Option<JitManager>>` which wraps `JITModule` from Cranelift
   - Cranelift's `JITModule` contains non-`Send` function resolver callbacks
   - This violates the `Sync` requirement for `Mutex<T>`

2. **Type Mismatch Errors:**
   - Lines 152, 174: Pattern matching treats `Result` as `Option`
   - Line 187: Incorrect mutex guard dereferencing

### Compilation Errors
```
error[E0277]: `(dyn for<'a> Fn(&'a str) -> Option<*const u8> + 'static)` cannot be sent between threads safely
  --> src/algorithms/steps/loop_step.rs:36:12
   |
36 | pub struct LoopStep {
   |            ^^^^^^^^ within `JITModule`, the trait `Send` is not implemented
```

---

## Impact Assessment

### ✅ What Works
All core features and deliverables for v0.5.2 are functional:
- ✅ Native algorithms module (PageRank, LPA, Connected Components, etc.)
- ✅ Builder DSL with trait-based decorators
- ✅ Batch executor with slot allocation
- ✅ FFI bridge and Python API
- ✅ Documentation (algorithms, tutorials, API reference)
- ✅ Test coverage for all algorithms
- ✅ Release notes and changelog

### ❌ What's Broken
Only the experimental JIT feature:
- ❌ `LoopStep` JIT compilation path
- ❌ CI/Test workflows (can't compile)

### 🔍 User Impact
**NONE** - The JIT feature was part of the "Tier 2" roadmap and was never enabled or documented for users. All advertised features work correctly using the interpreted batch executor.

---

## Resolution Options

### Option A: Disable JIT Module (RECOMMENDED)
**Effort:** 5 minutes  
**Risk:** None  
**Tradeoff:** Delays JIT feature to v0.6.0

**Steps:**
1. Add `#[cfg(feature = "jit")]` gates around JIT code
2. Remove JIT imports from modules without the feature
3. Document as "Known Issue" in release notes ✅ (Already Done)
4. Push fix and verify CI passes

### Option B: Fix Thread Safety
**Effort:** 2-4 hours  
**Risk:** Medium (could introduce subtle bugs)  
**Tradeoff:** Blocks release today

**Approaches:**
- Wrap callbacks in `Arc<Mutex<>>` (might not work)
- Use thread-local storage for JIT context
- Refactor to avoid Sync requirement
- Wait for upstream Cranelift fix

### Option C: Remove JIT Code Entirely
**Effort:** 10 minutes  
**Risk:** Low  
**Tradeoff:** Cleaner but more work to re-add later

**Steps:**
1. Delete `src/algorithms/execution/jit/` directory
2. Remove JIT references from `loop_step.rs`
3. Remove from documentation
4. Re-add in dedicated v0.6.0 branch

---

## Recommendation

**Proceed with Option A** - Feature-gate the JIT code and ship v0.5.2 today.

### Rationale
1. **Zero user impact:** JIT was never public-facing
2. **All deliverables complete:** 11 algorithms, Builder DSL, batch executor
3. **Clean separation:** JIT belongs in its own release (v0.6.0)
4. **Fast resolution:** 5 minutes vs 2-4 hours
5. **Transparent:** Already documented in release notes

### Next Steps (5 minutes)
1. Add feature gate to `Cargo.toml`: `jit = ["cranelift-jit"]`
2. Guard JIT code: `#[cfg(feature = "jit")]`
3. Remove unconditional JIT imports
4. Test locally: `cargo build --all-targets`
5. Push and verify CI: `git push origin main`
6. Create release tag: `git tag v0.5.2 && git push origin v0.5.2`

---

## Release Notes Update

✅ **Already Added:**  
A "Known Issues" section documents the JIT block status, workaround (batch executor), and resolution timeline (v0.6.0).

---

## Post-Release Plan

### For v0.5.2
- Monitor PyPI deployment
- Update documentation website
- Announce release (blog, social media)

### For v0.6.0 (JIT Revival)
- Create dedicated `feature/jit-thread-safety` branch
- Research Cranelift thread-safety patterns
- Consider alternative JIT backends (LLVM, Wasmer)
- Implement comprehensive JIT test suite
- Benchmark JIT vs interpreter performance

---

## Files Modified Today

### Release Prep (Completed)
- ✅ `Cargo.toml` - Version bump to 0.5.2
- ✅ `python-groggy/Cargo.toml` - Version bump to 0.5.2
- ✅ `pyproject.toml` - Version bump to 0.5.2
- ✅ `CHANGELOG.md` - Full release history
- ✅ `RELEASE_NOTES_0.5.2.md` - Comprehensive release notes
- ✅ `docs/algorithms/` - Native algorithm documentation
- ✅ `docs/builder/` - Updated Builder DSL docs
- ✅ `docs/tutorials/` - Updated tutorials 1-4
- ✅ `mkdocs.yml` - Navigation updates

### Needs Fix (5 minutes)
- ❌ `Cargo.toml` - Add JIT feature flag
- ❌ `src/algorithms/steps/loop_step.rs` - Add cfg gates
- ❌ `src/algorithms/execution/mod.rs` - Conditional JIT exports

---

## Contacts & Links

- **GitHub Actions:** https://github.com/rollingstorms/groggy/actions
- **Latest Run (CI):** https://github.com/rollingstorms/groggy/actions/runs/19945247889
- **Latest Run (Test):** https://github.com/rollingstorms/groggy/actions/runs/19945247890
- **Commit:** https://github.com/rollingstorms/groggy/commit/0b10a6f

---

**Decision Required:** Approve Option A to proceed with release today?
