qiaozhanwei opened a new pull request #2380: refactor-worker merge to dev URL: https://github.com/apache/incubator-dolphinscheduler/pull/2380 issue #1658 This modify main point : 1，Master kill task use netty communication 2，cpu and memory loabalance selector development 3，Master/Worker heartbeat refactor 4，Worker group refactor 5，ProcessInstance and TaskInstance priority refactor 6，Master/Worker fault tolerant refactor 7，Worker server remove db dependent 8，Configuration file optimization
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