Month 2025-10 – Apache Pulsar (pulse/ledger deletions) Summary: Delivered Ledger Deletion Rate Limiting to prevent ZooKeeper pressure during large topic retention reductions. Introduced a new configuration parameter managedLedgerDeleteMaxConcurrentRequests to govern concurrency of ledger deletions at the broker level. The feature is backward/forward compatible and enabled by default, and is applied across Pulsar broker and BookKeeper broker to stabilize performance under heavy delete load. This work reduces operational risk during retention scale-down and improves overall cluster reliability. Key references: commits implementing PIP-444 for rate limiting the deletion of ledgers to alleviate zk pressure (60eb20d4b998171abde2e3d3750f41d4aeab21c7) and broker-focused changes (ee33c99606e8f573dc55f47529e7c209bd8194e3).

2025-08 monthly summary for apache/bookkeeper. Key feature delivered: BookKeeper Metadata Garbage Collection Rate Limiting (gcMetadataOpRateLimit) to cap metadata operations during GC, reducing ZooKeeper load. Changes included updates to ScanAndCompareGarbageCollector.java and ServerConfiguration.java, plus a new test validating rate limiting. No major bugs fixed this month. Impact: improved cluster stability and throughput during GC, lower risk of ZooKeeper saturation. Technologies demonstrated: Java, ZooKeeper, GC orchestration, test-driven development, configuration management. Business value: more predictable maintenance windows, fewer GC-induced outages, and better operator experience.

June 2025 monthly summary for apache/pulsar: Key feature delivery focused on performance optimization and observability in InMemoryDelayedDeliveryTracker. Replaced delayed messages count computation with an AtomicLong to reduce CPU usage and added observability by logging discrepancies when internal counts diverge from delayedMessagesCount. This work improves throughput under heavy delayed delivery loads and provides faster diagnosability in production.