acyclic graph

基本解释

A Dryad job is a graph generator which can synthesize any directed acyclic graph.
Dryad job是个图形生成器，可以合成任意方向的无圈图。
A product type hierarchy is a strict tree, whereas a category hierarchy can be a directed acyclic graph.
产品类型层次结构是一个严格的树，而类别层次结构则是一个有方向的非循环图表。
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.
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。