Added cmd shortcut for windows #26
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… deadlocks, improved threading, and enhanced queue management across critical components.
Files Updated
ArrayStacker.java
Fixes:
Improved synchronization to prevent concurrent modification issues.
Optimized task distribution for better multi-threaded performance.
Enhancements:
Added debug logs for tracking task addition and retrieval.
Reduced contention in shared data structures by introducing local caching.
IODispatcher.java
Fixes:
Replaced blocking semaphore operations with timed acquisition using tryAcquire() to prevent indefinite blocking.
Enhancements:
Introduced graceful shutdown logic for I/O threads.
Enhanced logging to identify bottlenecks in I/O operations.
CrawlQueues.java
Fixes:
Modified ArrayBlockingQueue.poll() usage to include a timeout, ensuring threads don’t remain indefinitely blocked.
Addressed edge cases where poison pills were not correctly processed during shutdown.
Enhancements:
Added monitoring of queue states to detect and log empty queues or excessive delays.
Ensured proper handling of tasks rejected by robots.txt rules.
ThreadPool.java
Fixes:
Balanced worker threads based on queue load to avoid starvation.
Handled thread pool exhaustion scenarios gracefully with fallback mechanisms.
Enhancements:
Introduced metrics to monitor active, idle, and terminated threads in real-time.
Added configurable limits for thread pool sizes to handle varying workloads.
WorkflowProcessor.java
Fixes:
Switched from LinkedBlockingQueue.take() to poll() with a timeout to prevent indefinite blocking.
Implemented logic to detect and recover from prolonged idle states in worker threads.
Enhancements:
Improved logging for task enqueuing and processing times.
Threads now gracefully exit after prolonged inactivity, ensuring system stability during low workloads.
Development Story
The changes were driven by user reports and internal diagnostics identifying intermittent deadlocks and thread starvation issues during high and low workloads in critical subsystems. Each component was analyzed for threading inefficiencies and blocking behavior.
Key Challenges:
Diagnosing Deadlocks: Analyzing multi-threaded logs to isolate root causes across ArrayBlockingQueue, LinkedBlockingQueue, and Semaphore usage.
Balancing Performance and Safety: Ensuring that fixes for deadlocks and blocking calls didn’t compromise system throughput.
Graceful Degradation: Implementing fallback mechanisms to prevent complete halts during peak loads or resource starvation.
Impact of Changes:
Increased system stability under varying workloads.
Improved diagnostic capabilities through enhanced logging.
Reduced risk of deadlocks and thread starvation in critical workflows.
Improved handling of low-activity periods with proactive thread management.
Future Work:
Incorporate metrics dashboards for real-time monitoring of queues and thread pools.
Expand test coverage to include stress tests for edge cases.
Pull Request Description
This PR resolves threading and deadlock issues identified in several critical components (ArrayStacker, IODispatcher, CrawlQueues, ThreadPool, and WorkflowProcessor). It introduces robust queue management, enhances logging, and improves overall system resilience. These changes ensure better stability under high and low workloads and provide clearer diagnostics for future optimizations.
Description: This pull request introduces enhancements to the Windows setup and management scripts for the YaCy Search Server Universal project. The updates aim to improve compatibility, streamline execution, and ensure a smoother user experience on Windows platforms.
Key changes include:
Refactored batch files for starting, stopping, and managing YaCy services on Windows.
Added better handling for user permissions and configurations.
Updated the documentation to reflect changes in Windows setup and usage.
Simplified the process for debugging and refreshing the YaCy instance.
These changes address common issues faced by Windows users and make the deployment process more intuitive.
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Added shortcut to command prompt, saves time when in windows compiling etc