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chrislu
cd9b39ca50
Implements automatic cleanup of topic partitions with no active publishers or subscribers to prevent memory accumulation from short-lived topics. **Key Features:** 1. Activity Tracking (local_partition.go) - Added lastActivityTime field to LocalPartition - UpdateActivity() called on publish, subscribe, and message reads - IsIdle() checks if partition has no publishers/subscribers - GetIdleDuration() returns time since last activity - ShouldCleanup() determines if partition eligible for cleanup 2. Cleanup Task (local_manager.go) - Background goroutine runs every 1 minute (configurable) - Removes partitions idle for > 5 minutes (configurable) - Automatically removes empty topics after all partitions cleaned - Proper shutdown handling with WaitForCleanupShutdown() 3. Broker Integration (broker_server.go) - StartIdlePartitionCleanup() called on broker startup - Default: check every 1 minute, cleanup after 5 minutes idle - Transparent operation with sensible defaults **Cleanup Process:** - Checks: partition.Publishers.Size() == 0 && partition.Subscribers.Size() == 0 - Calls partition.Shutdown() to: - Flush all data to disk (no data loss) - Stop 3 goroutines (loopFlush, loopInterval, cleanupLoop) - Free in-memory buffers (~100KB-10MB per partition) - Close LogBuffer resources - Removes partition from LocalTopic.Partitions - Removes topic if no partitions remain **Benefits:** - Prevents memory bloat from short-lived topics - Reduces goroutine count (3 per partition cleaned) - Zero configuration required - Data remains on disk, can be recreated on demand - No impact on active partitions **Example Logs:** I Started idle partition cleanup task (check: 1m, timeout: 5m) I Cleaning up idle partition topic-0 (idle for 5m12s, publishers=0, subscribers=0) I Cleaned up 2 idle partition(s) **Memory Freed per Partition:** - In-memory message buffer: ~100KB-10MB - Disk buffer cache - 3 goroutines - Publisher/subscriber tracking maps - Condition variables and mutexes **Related Issue:** Prevents memory accumulation in systems with high topic churn or many short-lived consumer groups, improving long-term stability and resource efficiency. **Testing:** - Compiles cleanly - No linting errors - Ready for integration testing fmt