brettwooldridge/HikariCP
HikariCP
HikariCP is a high-concurrency JDBC connection pooling library for Java applications. It provides a reusable set of database connections to reduce the overhead of creating new connections for every request, enabling low-latency database access for applications handling large volumes of simultaneous requests.
The project utilizes lock-free connection pooling and non-blocking data structures to ensure high performance. It includes specialized optimizations such as bytecode-optimized statement caching on the driver side to reduce SQL parsing overhead and proxy-based connection wrapping to track usage and recycle resources.
The library covers comprehensive database resource monitoring and health management, including connection leak detection, latency tracking, and active validation on checkout. It supports transaction behavior control, TCP keepalive configuration to prevent firewall timeouts, and integration with object relational mapping frameworks like Hibernate.
External administration and observability are provided through JMX-based remote management and a metrics registry for exporting pool statistics.
Features
- Connection Pooling - Provides a high-performance JDBC connection pooling implementation to reduce the overhead of creating new connections.
- Lock-Free Implementations - Employs lock-free collections to ensure extremely low latency in high-concurrency environments.
- Performance Tuning - Balances responsiveness and resource usage by controlling idle connection counts and active connection lifetimes.
- Timeout Management - Enforces strict limits on the time a request waits for a database connection.
