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並前往https://umbertogriffo.gitbook.io/apache-spark-best-practices-and-tuning/rdd/avoid_groupbykey_when_performing_an_associative_re/avoid-the-flatmap-join-groupby-pattern

Avoid the flatMap-join-groupBy pattern - Apache Spark - Best ...

Avoid the flatMap-join-groupBy pattern. When two datasets are already grouped by key and you want to join them and keep them grouped, you can just use ...

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