hadoop2.3.0cdh5.0.2 升级到cdh5.7.0

后儿就放假了，上班这心真心收不住，为了能充实的度过这难熬的两天，我决定搞个大工程。。。。。ps：我为啥这么期待放假呢，在沙发上像死人一样躺一天真的有意义嘛。。。。。。。

当然版本：hadoop2.3.0cdh5.0.2

机器：

	nn	dn	jn	rm	nm	jh	hmaster	hregionserver
mast1	是	是	是	是	是		是	是
mast2	是	是	是	是	是		是	是
mast3		是	是		是	是		是

目标版本：hadoop2.6.0cdh5.7.0

升级方式：Upgrading Unmanaged CDH Using the Command Line

升级注意事项：①从低于cdh5.4.0升级到cdh5.4.0或更高版本，需要进行hdfs元数据升级；

②从低于cdh5.2.0版本升级需要做如下升级：升级hdfs元数据

升级Sentry database

升级hive数据库

升级sqoop2数据库

③另外还要确保如下升级：升级Oozie数据库和共享数据库

如果向hdfs上传了spark集合jar文件，要上传文件的最新版本

升级步骤：

1.为升级做准备：

①使namenode进入安全模式，备份fsimage

[hadoop@mast1 conf]$ hdfs haadmin -getServiceState mast1

active

[hadoop@mast1 conf]$ hdfs dfsadmin -safemode enter

Safe mode is ON

[hadoop@mast1 conf]$ hdfs dfsadmin -saveNamespace

②确认无hadoop服务在运行

[root@mast1 ~]# ps -aef|grep java

root       9540   8838  0 15:34 pts/0    00:00:00 grep java

③在namenode（ha中active的namenode）中备份元数据（注意过程中如果发现lock文件，则从头开始再执行一遍）

[root@mast1 ~]# cd /app/hdp/dfs/name

[root@mast1 name]# tar -cvf /root/nn_backup_data.tar .

./

./edits/

./edits/current/

./edits/current/edits_inprogress_0000000000000000624

./edits/current/edits_0000000000000000413-0000000000000000533

./edits/current/edits_0000000000000000620-0000000000000000621

./edits/current/edits_0000000000000000618-0000000000000000619

./edits/current/edits_0000000000000000062-0000000000000000180

./edits/current/edits_0000000000000000622-0000000000000000623

./edits/current/edits_0000000000000000038-0000000000000000050

./edits/current/edits_0000000000000000534-0000000000000000615

./edits/current/edits_0000000000000000181-0000000000000000182

./edits/current/edits_0000000000000000284-0000000000000000412

./edits/current/edits_0000000000000000051-0000000000000000061

./edits/current/seen_txid

./edits/current/edits_0000000000000000183-0000000000000000283

./edits/current/VERSION

./edits/current/edits_0000000000000000616-0000000000000000617

./current/

./current/fsimage_0000000000000000000

./current/seen_txid

./current/VERSION

./current/fsimage_0000000000000000000.md5

./namesecondary/

2.下载CDH 5 "1-click" repository

https://archive.cloudera.com/cdh5/one-click-install/redhat/6/x86_64/cloudera-cdh-5-0.x86_64.rpm

3.更新