流水线 / 批任务
批任务：MapReduce 词频统计
用一个离线词频任务观察输入切片、Map、中间键 Shuffle 与 Reduce 汇总。
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.
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