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https://chenyansong.site/2017/04/18/bigdata/spark%E4%BB%8E%E5%85%A5%E9%97%A8%E5%88%B0%E7%B2%BE%E9%80%9A_%E7%AC%94%E8%AE%B0/Spark2.0%E6%96%B0%E7%89%B9%E6%80%A7%E4%B9%8BVolcano%20Iterator%20Model(%E7%81%AB%E5%B1%B1%E8%BF%AD%E4%BB%A3%E5%99%A8%E6%A8%A1%E5%9E%8B)/