目前，Storm中的StreamGroupings有如下哪几种方式？
A. AllGrouping：广播发送，每一个Task都会收到所有的Tuple
B. GlobalGrouping：全局分组，所有的Tuple都发送到同一个Task中
C. FieldsGrouping：按照字段分组，保证相同字段的Tuple分配到同一个Task中
D. DirectGrouping：随机分组，随机分发Stream中的Tuple，保证每个Bolt的Task接收Tuple数量大致一致
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目前，Storm中的StreamGroupings有如下哪几种方式？
A.AllGrouping：广播发送，每一个Task都会收到所有的Tuple B.GlobalGrouping：全局分组，所有的Tuple都发送到同一个Task中 C.FieldsGrouping：按照字段分组，保证相同字段的Tuple分配到同一个Task中 D.DirectGrouping：随机分组，随机分发Stream中的Tuple，保证每个Bolt的Task接收Tuple数量大致一致
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下列关于Storm框架，描述正确的有？
A.worker:每个worker进程都属于一个特定的Topology B.executor：executor是产生于worker进程内部的线程 C.task:实际的数据处理由task完成 D.在Topology的生命周期中，每个组件的task数目是不会发生变化的，而executor的数目却不一定
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关于Storm中Topology说法错误的是()。
A.Topology可视为流转换图 B.Topology可以被提交到Storm集群执行 C.在Topology里面可以指定每个组件的并行度，Storm会在集群里面分配那么多的线程来同时计算 D.Topology里面的每一个组件都是串行运行的
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______ scientists know where a storm will happen,winds will suddenly change, carrying the storm to a new direction.
A.ven if B.Since C.espite D.Unless
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A.tuple B.spout C.worker D.bolt
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ane delayed taking off as we ran into a storm. We were ________ for several hours at the airport, waiting for the storm to clear up.
A.figured out B.built up C.held up D.taken off;
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