1 HistoryServer
https://ci.apache.org/projects/flink/flink-docs-release-1.6/monitoring/historyserver.html
1.1 配置
1.2 执行一个作业然后观察
./bin/flink run -m yarn-cluster -yn 1 ./examples/batch/WordCount.jar
1.3 historyserver rest api 使用
http://master:8082/jobs/overview
2 常用优化策略