Hadoop Configurations (Properties)

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Hadoop运行的三种模式：

Standalone (or local) mode

Pseudodistributed mode

Fully distributed mode

模式的配置文件在 hadoop-2.8.1/etc/hadoop 目录：

core-site.xml for common properties

hdfs-site.xml for HDFS properties

mapred-site.xml for MapReduce properties

yarn-site.xml for YARN properties

这些配置文件负责的全部属性的默认设置文件，在 hadoop-2.8.1/share/doc/hadoop 目录：

hadoop-project-dist/hadoop-common/core-default.xml

hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml

hadoop-yarn/hadoop-yarn-common/yarn-default.xml

要让Hadoop运行在某个特定的模式，需要两件事情：

1. set the appropriate properties

2. start the Hadoop daemons

下面图片，是配置成每种模式时的最小属性集 (the minimal set of properties):

跟多的配置信息：

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