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HadoopÊÇÒ»¸ö Äܹ»¶Ô ´óÊý¾Ý ½øÐÐ ·Ö²¼Ê½ ´¦ÀíµÄ ¿ò¼Ü£¬ÊµÏÖÁË MapReduce±à³ÌÄ£Ðͺͼܹ¹£¬Äܹ» °Ñ Ó¦ÓóÌÐò ·Ö¸î ³É Ðí¶à СµÄ ¹¤×÷µ¥Ôª£¬²¢ÇÒ °ÑÕâЩ µ¥Ôª ·Åµ½ Èκμ¯Èº½Úµã ÉÏÖ´ÐС£
As a frame for distributed processing of big data, Hadoop realized MapReduce programming model architecture, and is capable of dividing application program into numerous small work unit, and then executing these units on any cluster node.

HadoopÖ÷ÒªÓÉ ·Ö²¼Ê½ Îļþϵͳ£¨HDFS£©ºÍ MapReduce±à³ÌÄ£ÐÍ ¹¹³É¡£·Ö²¼Ê½Îļþϵͳ Ö÷Òª¸ºÔð ¸÷½ÚµãÉ쵀 Êý¾ÝµÄ´æ´¢£¬²¢ÊµÏÖÁË ¸ßÍÌÍ嵀 Êý¾Ý¶Áд¡£MapReduce¼ÆËãÄ£ÐÍ Ö÷ÒªÓÉ MapºÍReduce Á½¸öº¯Êý×é³É£¬ËüÃÇÊÇ ÓÉ Óû§ ×Ô¶¨ÒåʵÏֵ쬯书ÄÜ Êǰ´Ò»¶¨µÄ Ó³É乿Ôò ½«ÊäÈëµÄ ÒÔ<Key,value> ¸ø³öµÄ Êý¾Ý ¶Ô ת»»³É ÁíÒ»¸ö»òÒ»Åú<Key,value>ÐÎʽµÄ Êý¾Ý Êä³ö¡£
Hadoop is composed of HDFS and MapReduce programming model. Hadoop is responsible for data storing on the nodes, realizing data reading and writing of high-throughput computing. While the MapReduce programming model,which is composed of the Map function and Reduce function, is realized by customized definition. The function of MapReduce programming model is to convert the input data written by <Key,value> into another(group of) output data written by based on certain mapping rule.
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