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罗祥
2020-05-25 11:05:03 +08:00
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notes/Flink_Data_Transformation.md
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@@ -234,7 +234,7 @@ dataStream.rescale();
ReScale 这个单词具有重新缩放的意义，其对应的操作也是如此，具体如下：如果上游 operation 并行度为 2，而下游的 operation 并行度为 6，则其中 1 个上游的 operation 会将元素分发到 3 个下游 operation，另 1 个上游 operation 则会将元素分发到另外 3 个下游 operation。反之亦然，如果上游的 operation 并行度为 6，而下游 operation 并行度为 2，则其中 3 个上游 operation 会将元素分发到 1 个下游 operation，另 3 个上游 operation 会将元素分发到另外 1 个下游operation：
<div align="center"> <img src="../pictures/flink-Rescaling.png"/> </div>
<div align="center"> <img src="https://gitee.com/heibaiying/BigData-Notes/raw/master/pictures/flink-Rescaling.png"/> </div>
### 3.4 Broadcasting [DataStream → DataStream]