gabrywu opened a new pull request #2734:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/2734
## What is the purpose of the pull request
1. remove unnecessary lock to ConcurrentHashMap
2. fix wrong variable reference inside
LowerWeightHostManager.syncWorkerHostWeight method
## Brief change log
- optimize LowerWeightHostManager.java
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