Following https://incubator.apache.org/guides/graduation.html#community_graduation_vote , this is a notification that Impala is having a community graduation vote at https://lists.apache.org/thread.html/a5a7c6895b3e019347d6e4e4cf49d67d094d31b8f2c7b4d59200f3e4@%3Cdev.impala.apache.org%3E
