hadoop 默认参数配置和调优设置
http://hadoop.apache.org/common/docs/current/hdfs-default.html
http://hadoop.apache.org/common/docs/current/core-default.html
http://hadoop.apache.org/common/docs/current/mapred-default.html
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http://wiki.apache.org/hadoop/HowManyMapsAndReduces
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新旧版本配置名对比：
http://hadoop.apache.org/common/docs/r0.23.0/hadoop-project-dist/hadoop-common/DeprecatedProperties.html
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总入口
http://hadoop.apache.org/common/docs/current/
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http://hadoop.apache.org/common/docs/current/hadoop-project-dist/hadoop-common/core-default.xml
http://hadoop.apache.org/common/docs/current/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml
http://hadoop.apache.org/common/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml
