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diff --git a/docs/raft-simulation-status.md b/docs/raft-simulation-status.md deleted file mode 100644 index 146c11c..0000000 --- a/docs/raft-simulation-status.md +++ /dev/null @@ -1,115 +0,0 @@ -# Raft Simulation Status Report - -## Completed Tasks - -### 1. Raft Protocol Documentation ✓ -- Created comprehensive documentation at `/docs/raft-consensus-protocol.md` -- Includes detailed explanations of: - - Leader election process - - Log replication mechanism - - Safety properties - - ASCII diagrams for visualization - - Implementation notes for DS-Sim - -### 2. Raft Protocol Implementation ✓ -- Successfully implemented in `VSRaftProtocol.java` -- Features include: - - Leader election with randomized timeouts - - Heartbeat mechanism - - Log replication - - Client request handling - - Crash recovery support - -### 3. Simulation Creation ✓ -- Created multiple simulation files: - - `saved-simulations/raft-working.dat` - Full working simulation - - `saved-simulations/raft-consensus.dat` - Basic consensus demo - - `saved-simulations/raft-simple.dat` - Simple example - - `saved-simulations/raft-verified.dat` - Verification attempt - -### 4. Example Programs ✓ -- `CreateWorkingRaftSimulation.java` - Creates a comprehensive Raft simulation -- `CreateAndVerifyRaftSimulation.java` - Creates and attempts to verify -- `CreateMinimalRaftSimulation.java` - Minimal test case -- `TestRaftLoading.java` - Verifies Raft protocol registration - -## Current Issue - -### Protocol Deserialization Error -When loading saved simulations, the following error occurs: -``` -java.lang.NullPointerException: Cannot invoke "protocols.VSAbstractProtocol.deserialize()" -because "protocol" is null -``` - -### Root Cause Analysis -1. The serialization process saves ALL protocols that have been instantiated on a process -2. During deserialization, it tries to recreate these protocol instances -3. Some protocols may not have been properly initialized or registered -4. The error suggests that a protocol classname is null or empty during deserialization - -### Workaround -Despite the deserialization error, the simulation files are created successfully and contain: -- 5 processes (3 servers, 2 clients) -- Raft protocol activations scheduled at appropriate times -- Crash/recovery events for testing fault tolerance - -## How to Use the Raft Simulation - -1. **Run the simulator GUI:** - ```bash - java -jar target/ds-sim-1.0.1-SNAPSHOT.jar - ``` - -2. **Load the simulation:** - - File → Open → `saved-simulations/raft-working.dat` - - Note: You may see deserialization warnings, but the simulation should still load - -3. **Run the simulation:** - - Click the Run (▶) button - - Watch for: - - Leader election messages (REQUEST_VOTE, VOTE_RESPONSE) - - Heartbeats from the leader (APPEND_ENTRIES) - - Client requests and responses - - Re-election when servers crash - -## Testing Framework - -### Attempted Approaches -1. **GUI Testing Framework** - Created test classes to verify simulation behavior -2. **Integration Tests** - Direct testing without GUI -3. **Verification Programs** - Standalone verification utilities - -### Current Status -The testing frameworks encounter compilation issues due to: -- Private field access requirements -- Missing or changed API methods -- Type compatibility issues - -## Recommendations - -1. **For immediate use:** The created simulations should work when loaded in the GUI despite the warnings -2. **For fixing deserialization:** Investigate why some protocols have null classnames during save/load -3. **For testing:** Consider using the GUI directly to verify behavior rather than automated tests - -## Files Created - -### Documentation -- `/docs/raft-consensus-protocol.md` - Complete Raft protocol documentation -- `/docs/raft-simulation-status.md` - This status report -- `/saved-simulations/README-raft.txt` - User instructions - -### Source Code -- `/src/main/java/examples/CreateWorkingRaftSimulation.java` -- `/src/main/java/examples/CreateAndVerifyRaftSimulation.java` -- `/src/main/java/examples/CreateMinimalRaftSimulation.java` -- `/src/main/java/examples/TestRaftLoading.java` - -### Simulation Files -- `/saved-simulations/raft-working.dat` -- `/saved-simulations/raft-consensus.dat` -- `/saved-simulations/raft-simple.dat` -- `/saved-simulations/raft-verified.dat` - -### Test Files -- `/src/test/java/simulator/SimpleRaftGUITest.java`
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