Worked on reliability improvements for the apache/pulsar repository by addressing a critical configuration issue in the BookKeeper integration. Focused on backend development and configuration management, the developer implemented a targeted fix to ensure the ZooKeeper timeout for the BookKeeper client is correctly set by propagating the metadataStoreSessionTimeoutMillis value from the broker configuration. This adjustment, made using Java and Properties files, resolved intermittent connection issues and enhanced cluster stability for deployments relying on BookKeeper-backed storage. The work demonstrated a strong understanding of distributed system configuration, particularly in managing ZooKeeper and BookKeeper interactions to reduce operational risk and downtime.