PreetPatel45 opened a new pull request, #148:
URL: https://github.com/apache/hbase-operator-tools/pull/148

   # Refactoring: Enhance Maintainability Without Functional Changes  
   
   ## ✅ **Validation**  
   ✔ **All existing tests pass** (unit/integration)  
   ✔ **Build succeeds** (`mvn clean install`)  
   ✔ **Manual verification** of HBCK2 commands → No behavioral changes  
   
   ## 🔧 **Improvements**  
   1. **Reduced code duplication**  
      - New `BaseMaintenanceTool` abstract class for shared logic between 
`RegionMerger` and `MissingRegionDirsTool`.  
   2. **Simplified complex logic**  
      - Extracted `HBCK2CommandUsage` (reduced `HBCK2` by 300+ LOC).  
      - Decomposed `doCommandLine` (cyclomatic complexity ↓ from 17).  
   3. **Clearer threading logic**  
      - Introduced explaining variables (`availableProcessors`, 
`threadPoolSize`).  
   
   ## 📌 **Why Merge This?**  
   - **Zero-risk refactoring** → Pure structural changes, no side effects.  
   - **Easier to debug/extend** → Better encapsulation, less duplication.  
   - **Follows SOLID principles** → More modular design.  
   
   💡 **Review focus**: Verify thread pool changes and new class structure.  


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