lgcareer opened a new pull request #4250:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4250
## What is the purpose of the pull request
*[Fix-4222][Master]Add the priority queue to ensure that tasks are submitted
according to priority.*
## Brief change log
*[Fix-4222][Master]Add the priority queue to ensure that tasks are submitted
according to priority.*
- *Replace map with priority queue in MasterExecThread*
- *Add PeerTaskInstancePriorityQueueTest*
- *Add PeerTaskInstancePriorityQueue*
## Verify this pull request
*PeerTaskInstancePriorityQueueTest*
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