Ubuntu 14.04下Hadoop集群安装(2)

$ vim .bashrc  //编辑文件，添加如下几行
export HADOOP_HOME=/home/hduser/hadoop
export JAVA_HOME=/usr/lib/jvm/java-8-oracle
PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
$ source  .bashrc  //source使其立即生效

分别在master和slave节点上执行以下操作,更改Hadoop-env的JAVA_HOME：

$ vim /home/hduser/hadoop/etc/hadoop/hadoop-env.sh
#export JAVA_HOME=${JAVA_HOME}  //更改此行，或者注释掉新加以下一行
export JAVA_HOME=/usr/lib/jvm/java-8-oracle

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7.Hadoop配置

Hadoop的配置这里主要涉及四个配置文件：etc/hadoop/core-site.xml，etc/hadoop/hdfs-site.xml, etc/hadoop/yarn-site.xml and etc/hadoop/mapred-site.xml.

这里摘录网络上的一段话，在继续下面的操作之前一定要阅读这段，以便更好的理解：

Hadoop Distributed File System: A distributed file system that provides high-throughput access to application data. A HDFS cluster primarily consists of a NameNode that manages the file system metadata and DataNodes that store the actual data. If you compare HDFS to a traditional storage structures ( e.g. FAT, NTFS), then NameNode is analogous to a Directory Node structure, and DataNode is analogous to actual file storage blocks.

Hadoop YARN: A framework for job scheduling and cluster resource management.

Hadoop MapReduce: A YARN-based system for parallel processing of large data sets.