我安装了cloudera管理器(CDH 5)并创建了自己的claster。一切都很好,但是当我运行任务时,它运行得很慢(18分钟)。但是红宝石的剧本大约运行了5秒。#mapper.py for word in doc.split(): for key, value in do_map(line):
print(key + "\t" + str(valu
我已经编写了将字符串写入文件的Java代码。字符串的大小将很难达到10KB。void writeMethod(String string, int m) if (m == 1) FileChannel rwChannel = new RandomAccessFile(filePath, "rw").getChannel();
ByteBuffer wrBuf = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, s