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The first act of a new core committer is typically to add their name to the credits page. This requires changing the source in https://github.com/apache/hive-site/blob/main/content/community/people.md
Committers are strongly encouraged to subscribe to the security@hive.apache.org list with their Apache email and help addressing security vulnerability reports.
Review
Hive committers should, as often as possible, attempt to review Pull Requests submitted by others. Ideally every submitted PR will get reviewed by a committer within a few days. If a committer reviews a PR they've not authored, and believe it to be of sufficient quality, then they can merge the PR, otherwise the PR should be cancelled with a clear explanation for why it was rejected.
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Dialog
Committers/Contributors should can hang out in the #hive channel in Apache Slack workspace for real-time discussions. However any substantive discussion (as with any off-list project-related discussion) should be re-iterated in Jira or on the developer list.
Note: Committers or individuals with Apache Id can directly joint join the #hive slack channel on Apache Workspace, any other individual if interested should drop a mail to hive dev mailing list with his email id and any existing member of the #hive apache channel should be able to send him the invite to join the group.
Instructions to add folks to ASF hive channel: https://infra.apache.org/slack.html