Morphium 6.1.8 - Release Summary

Quick Summary

Stability release focused on connection pool reliability, test stabilization, and documentation improvements.

Key Fixes

Connection Pool

• Counter drift / pool exhaustion: Fixed incorrect borrowed counter decrement under topology changes
• Heartbeat connection leak: Connections are now properly closed in finally blocks when getHelloResult() or connect() throws during heartbeat
• ReadPreference fall-through: Documented intentional NEAREST -> PRIMARY_PREFERRED -> SECONDARY degradation path

Test Infrastructure

• Split long-running QueryTest and ObjectMapperTest into focused classes for better maintainability
• Tuned timeouts for more resilient test execution under load
• Improved test scripts (rg stdin fallback, log file handling)

Documentation

• Added SSL/TLS documentation and benchmark results
• Added v5 vs v6 performance comparison
• Fixed messaging comparison (v5 also had ChangeStream)

Requirements

• Java 21+
• MongoDB 5.0+ (for production deployments)

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For detailed changelog, see the 6.1.8 section in CHANGELOG.md.