本文介绍Python的os包中有查询和修改进程信息的函数，Python的这些工具符合Linux系统的相关概念，所以可以帮助理解Linux体系。

初步了解Python多进程之后，我们可以继续探索multiprocessing包中更加高级的工具。这些工具可以让我们更加便利地实现多进程。

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/sources/definedTimeAttributes.scala

flink-streaming-java_2.11-1.7.0-sources.jar!/org/apache/flink/streaming/api/TimerService.java

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/api/table.scala

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/api/table.scala

本文主要研究一下flink的consecutive windowed operations

flink-streaming-java_2.11-1.7.0-sources.jar!/org/apache/flink/streaming/api/datastream/DataStream.java

flink-streaming-java_2.11-1.7.0-sources.jar!/org/apache/flink/streaming/api/windowing/windows/GlobalWindow.java

flink-streaming-java_2.11-1.7.0-sources.jar!/org/apache/flink/streaming/api/windowing/triggers/Trigger.java