http://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-common/core-default.xml

http://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

http://hadoop.apache.org/docs/r2.7.3/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml

http://hadoop.apache.org/docs/r2.7.3/hadoop-yarn/hadoop-yarn-common/yarn-default.xml

http://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-common/DeprecatedProperties.html

hadoop 2.73‘s four xml