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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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Instructions to add folks to ASF hive channel: https://infra.apache.org/slack.html