最近在teaclave中执行gbdt训练时,发现对大样本文件(大约1.7G)进行训练时占用内存十分巨大。
因此想请问下,在利用Runtime获取到输入文件的reader和输出文件的writer时,reader.lines() 
是将整个文件内容加载到内存中,进行操作,还是流式操作的呢?

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