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关于preSql和postSql执行的问题 #70

@OpenZYK

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@OpenZYK

1.请问Latch是如何在多个TaskManager之间起到同步作业的?并没有看到有关全局同步相关的代码。
2.在JdbcOutputFormat中close()方法中执行了postSql,但是flink的task会在close之后才会flush数据,请问如何保证执行postSql的时候数据都已经flush完成?

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