During November 2024, this developer enhanced DNS resolution reliability for the apache/pulsar repository by implementing a feature that enables TCP-based retries when DNS timeouts occur. Working in Java and leveraging network programming expertise, they modified the DnsNameResolverBuilder, ConnectionPool, and ProxyService components to explicitly set the socket channel type, ensuring DNS lookups can seamlessly fall back to TCP in UDP-restricted or high-latency environments. This approach reduced intermittent DNS failures and improved connection setup times, directly supporting Pulsar’s reliability goals. The developer also prepared documentation and design rationale to facilitate broader adoption and future optimization of the DNS resolution process.