leehom opened a new issue #3944: URL: https://github.com/apache/incubator-dolphinscheduler/issues/3944
现状：专门线程MasterTaskExecThread轮询数据库，
建议：使用binlog 或者 cdc 事件驱动方式，有效减少线程使用，轮询对数据库压力
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