Most Pinot related discussion happens on the dev mailing list, Github Issues and Slack.
For project development:
dev-subscribe@pinot.apache.org (subscribe to pinot-dev mailing list)
dev@pinot.apache.org (posting to pinot-dev mailing list)
For general questions and announcement:
users-subscribe@pinot.apache.org (subscribe to pinot-user mailing list)
users@pinot.apache.org (posting to pinot-user mailing list)
Star us at apache/pinot to follow Pinot development, ask questions, raise issues, or contribute pull requests. See Developers and Contributors section if you're interested in development.
Ask questions on Apache Pinot Slack.
Follow us on Twitter @ApachePinot.
See Apache Pinot on Meetup.com for upcoming meetup events.