Hadoop版本升级之Hadoop2.5.2滚动升级到Hadoop2.10.2（Hadoop HA）

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前言

简要记录升级过程，备忘
如参考本步骤升级的，请在测试环境测试
升级步骤仅供参考，出现任何问题，责任自负，谢谢！

一、 升级前准备

1. 解压Hadoop2.10.2

上传到目录/home/softwares

 tar –zxvf hadoop-2.10.2.tar.gz

2. 拷贝旧配置文件到新版本

cp $HADOOP_HOME/etc/hadoop/core-site.xml /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/hadoop-env.sh /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/hdfs-site.xml /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/log4j.properties /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/mapred-site.xml /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/masters /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/slaves /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/etc/hadoop/fair-scheduler.xml /home/softwares/hadoop-2.10.2/etc/hadoop
cp $HADOOP_HOME/share/hadoop/common/lib/zookeeper-3.4.6