FIXED:固定
Once the database has been opened, these configuration options cannot be changed forthe entire life ofthe database
GLOBAL_OFFLINE:全局脱机
These options can only be changed forthe entire database cluster at once when all instances are shut down
GLOBAL:全局的
These options can only be changed globally across the entire database cluster
MASKABLE:可屏蔽的
These options are global but can be overwritten byalocal configuration file
LOCAL:局部的
These options can only be provided through alocal configuration file
Umbrella Namespace
log.user.send-batch-size=100
Configuration Namespaces and Options 3.1. attributes.custom *