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第五章《迭代型 Spark 应用》勘误与修改建议 #6

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JerryLead opened this issue Jul 20, 2020 · 2 comments
Open

第五章《迭代型 Spark 应用》勘误与修改建议 #6

JerryLead opened this issue Jul 20, 2020 · 2 comments

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@JerryLead
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@ycli12
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ycli12 commented Feb 20, 2023

你好，P129页的5.2.3章节中，有一句话，“每轮迭代开始时，Spark首先将w广播到所有task中”，在5.2.2章节中给出的代码样例实际上没有广播，只是放到lambda闭包然后跟随Task序列化发送到Executor，每个Task都有一份

@JerryLead
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@ycli12 你好，书里对这个过程进行了抽象，这个过程抽象看就是broadcast，只是实现方式是闭包传输，如果参数更大一些，闭包传输不了，就需要单独进行broadcast。

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@JerryLead @ycli12