WebSphere DataStage的作业定序器是一种图形化工具，程序员可以通过它来指定要运行的一系列作业，以及带循环和流控制的异常处理。

WebSphere DataStage's job sequencer is a graphical tool that allows developers to specify a sequence of jobs to run, along with exception handling with looping and flow control.

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Oozie工作流是放置在控制依赖DAG（有向无环图 Direct Acyclic Graph）中的一组动作（例如，Hadoop的Map/Reduce作业、Pig作业等），其中指定了动作执行的顺序。

Oozie workflow is a collection of actions (i.e. Hadoop Map/Reduce jobs, Pig jobs) arranged in a control dependency DAG (Direct Acyclic Graph), specifying a sequence of actions execution.

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要让流准时发生，可以使用 UNIX cron 作业，该命令可提供丰富的语义来控制作业执行计划。

To make a flow run hourly on the hour, you can use a UNIX cron job, which can provide rich semantics to control job scheduling.

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