1.HDFS启动说明
第一次启动:
[root@hadoop000 hadoop-2.8.1]# sbin/start-dfs.sh
Starting namenodes on [localhost]
localhost: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-root-namenode-hadoop000.out
localhost: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-root-datanode-hadoop000.out
Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established.
RSA key fingerprint is ec:85:86:32:22:94:d1:a9:f2:0b:c5:12:3f:ba:e2:61.
Are you sure you want to continue connecting (yes/no)? yes
0.0.0.0: Warning: Permanently added '0.0.0.0' (RSA) to the list of known hosts.
0.0.0.0: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-root-secondarynamenode-hadoop000.out
[root@hadoop000 hadoop-2.8.1]#
[root@hadoop000 sbin]# jps
2906 SecondaryNameNode
3019 Jps
2604 NameNode
2700 DataNode
第二次启动:
[root@hadoop000 sbin]# ./start-dfs.sh
Starting namenodes on [localhost]
localhost: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-root-namenode-hadoop000.out
localhost: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-root-datanode-hadoop000.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-root-secondarynamenode-hadoop000.out
[root@hadoop000 sbin]#
观察:
namenode：localhost
datanode：localhost
secondary namenodes： 0.0.0.0
namenode： vi core-site.xmlfs.defaultFShdfs://192.168.137.251:9000
datanode：vi slaves192.168.137.251
2.jps 查看Java接口的进程号
2.1 which
[root@hadoop000 sbin]# which jps
/usr/java/jdk1.8.0_45/bin/jps
2.2 重新以hadoop用户部署hdfs
[root@hadoop000 ~]# id hadoop
uid=502(hadoop) gid=503(hadoop) groups=503(hadoop)
[root@hadoop000 sbin]# passwd hadoop
Changing password for user hadoop.
New password:
BAD PASSWORD: it is too simplistic/systematic
BAD PASSWORD: is too simple
Retype new password:
passwd: all authentication tokens updated successfully.
[root@hadoop000 sbin]#
[root@hadoop000 ~]# cd /opt/software/
[root@hadoop000 software]# chown -R hadoop:hadoop hadoop-2.8.1
[root@hadoop000 ~]# kill -9 $(pgrep -f hadoop)
[root@hadoop000 ~]# rm -rf /tmp/hadoop-* /tmp/hsperfdata-*
[root@hadoop000 ~]# su - hadoop
[hadoop@hadoop000 ~]$ ll
total 0
[hadoop@hadoop000 ~]$ ll -a
total 40
drwx------. 5 hadoop hadoop 4096 May 16 21:27 .
drwxr-xr-x. 5 root root 4096 May 5 14:31 ..
-rw-------. 1 hadoop hadoop 290 May 16 21:34 .bash_history
-rw-r--r--. 1 hadoop hadoop 18 Jul 18 2013 .bash_logout
-rw-r--r--. 1 hadoop hadoop 176 Jul 18 2013 .bash_profile
-rw-r--r--. 1 hadoop hadoop 124 Jul 18 2013 .bashrc
drwxr-xr-x. 2 hadoop hadoop 4096 Nov 12 2010 .gnome2
drwxr-xr-x. 4 hadoop hadoop 4096 Apr 28 04:56 .mozilla
drwx------. 2 hadoop hadoop 4096 May 16 21:28 .ssh
-rw-------. 1 hadoop hadoop 749 May 5 14:37 .viminfo
[hadoop@hadoop000 ~]$ rm -rf .ssh
[hadoop@hadoop000 ~]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
Created directory '/home/hadoop/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
28:f0:a8:e8:19:21:74:c5:ba:cf:6f:04:5a:b0:a4:97 hadoop@hadoop000
The key's randomart image is:
+--[ RSA 2048]----+
| .. |
| o.. |
| .+.= |
|...E o . |
|..o * o S |
|o..o . . |
|o. o . |
|. o o . |
| o o. |
+-----------------+
[hadoop@hadoop000 ~]$ ll
total 0
[hadoop@hadoop000 ~]$ cd .ssh
[hadoop@hadoop000 .ssh]$ ll
total 8
-rw-------. 1 hadoop hadoop 1675 May 16 21:44 id_rsa
-rw-r--r--. 1 hadoop hadoop 398 May 16 21:44 id_rsa.pub
[hadoop@hadoop000 .ssh]$ cat id_rsa.pub >> authorized_keys
[hadoop@hadoop000 .ssh]$ chmod 600 authorized_keys
[hadoop@hadoop000 .ssh]$
[hadoop@hadoop000 .ssh]$
[hadoop@hadoop000 .ssh]$ ssh hadoop000 date
The authenticity of host 'hadoop000 (192.168.137.251)' can't be established.
RSA key fingerprint is ec:85:86:32:22:94:d1:a9:f2:0b:c5:12:3f:ba:e2:61.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'hadoop000,192.168.137.251' (RSA) to the list of known hosts.
Wed May 16 21:45:00 CST 2018
[hadoop@hadoop000 .ssh]$
[hadoop@hadoop000 .ssh]$
[hadoop@hadoop000 .ssh]$ ssh hadoop000 date
Wed May 16 21:45:09 CST 2018
[hadoop@hadoop000 .ssh]$
[hadoop@hadoop000 hadoop-2.8.1]$ hdfs namenode -format
配置参数.........
[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-dfs.sh
Starting namenodes on [hadoop000]
hadoop000: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop000.out
192.168.137.251: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop000.out
Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established.
RSA key fingerprint is ec:85:86:32:22:94:d1:a9:f2:0b:c5:12:3f:ba:e2:61.
Are you sure you want to continue connecting (yes/no)? yes
0.0.0.0: Warning: Permanently added '0.0.0.0' (RSA) to the list of known hosts.
0.0.0.0: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-secondarynamenode-hadoop000.out
starting secondarynamenode：0.0.0.0vi hdfs-site.xmldfs.namenode.secondary.http-address192.168.137.251:50090dfs.namenode.secondary.https-address192.168.137.251:50091
为什么三个进程要修改为hadoop000?
1.对外提供服务 和 集群配置
2.第一次启动之前我们是配置当前hadoop000的无密码信任
总结：
1.怎样配置三个进程以hadoop000启动？为什么三个进程要修改为hadoop000?
2.hadoop用户的信任关系 和root是不一样的？
3.我们要知道怎样重新部署HDFS？
数据存储删除--》格式化--》启动
4.官网的xml文件学会查看
2.3 process information unavailable 状态的真假判断
状态: 进程不存在，且process information unavailable
[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-dfs.sh
Starting namenodes on [hadoop000]
hadoop000: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop000.out
192.168.137.251: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop000.out
Starting secondary namenodes [hadoop000]
hadoop000: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-secondarynamenode-hadoop000.out
[hadoop@hadoop000 hadoop-2.8.1]$ jps
16896 SecondaryNameNode
17072 Jps
16647 NameNode
16750 DataNode
[hadoop@hadoop000 hadoop-2.8.1]$
[root@hadoop000 ~]# jps
16896 -- process information unavailable
16647 -- process information unavailable
17084 Jps
16750 -- process information unavailable
[root@hadoop000 ~]#
[root@hadoop000 ~]#
[root@hadoop000 ~]# ps -ef|grep 16896
root 17095 4052 0 22:16 pts/2 00:00:00 grep 16896
状态: 进程存在，且process information unavailable
[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-dfs.sh
Starting namenodes on [hadoop000]
hadoop000: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop000.out
192.168.137.251: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop000.out
Starting secondary namenodes [hadoop000]
hadoop000: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-secondarynamenode-hadoop000.out
[hadoop@hadoop000 hadoop-2.8.1]$ jps
17316 DataNode
17463 SecondaryNameNode
17211 NameNode
17598 Jps
[hadoop@hadoop000 hadoop-2.8.1]$
process information unavailable进程号自动变化了？
[root@hadoop000 ~]# jps
17649 Jps
17316 -- process information unavailable
17463 -- process information unavailable
17211 -- process information unavailable
jps查询的是当前用户的 hsperfdata_当前用户/文件
[root@hadoop000 ~]# kill -9 $(pgrep -f hadoop-2.8.1)
[root@hadoop000 ~]# jps
17316 -- process information unavailable
17463 -- process information unavailable
17688 Jps
17211 -- process information unavailable
[root@hadoop000 ~]#
[root@hadoop000 tmp]# cd hsperfdata_hadoop/
[root@hadoop000 hsperfdata_hadoop]# ll
total 96
-rw-------. 1 hadoop hadoop 32768 May 16 22:22 17211
-rw-------. 1 hadoop hadoop 32768 May 16 22:22 17316
-rw-------. 1 hadoop hadoop 32768 May 16 22:22 17463
[root@hadoop000 hsperfdata_hadoop]# ll
total 96
-rw-------. 1 hadoop hadoop 32768 May 16 22:23 17211
-rw-------. 1 hadoop hadoop 32768 May 16 22:23 17316
-rw-------. 1 hadoop hadoop 32768 May 16 22:23 17463
[root@hadoop000 hsperfdata_hadoop]# rm -f *
[root@hadoop000 hsperfdata_hadoop]# ll
total 0
[root@hadoop000 hsperfdata_hadoop]#
[root@hadoop000 ~]# jps
17702 Jps
生产: process information unavailable
1.找到进程号jps
2.ps -ef|grep pid 是否存在
3.假如不存在，我们可以去该/tmp/hsperfdata_xxx 去删除？
4.假如存在，当前用户查看就是process information unavailable ，
那么怎样查看是有用的？(切换用户查看)
3.YARN伪分布式部署[hadoop@hadoop000 hadoop]$ cp mapred-site.xml.template mapred-site.xml[hadoop@hadoop000 hadoop]$ vi mapred-site.xmlmapreduce.framework.nameyarn
[hadoop@hadoop000 hadoop]$ vi yarn-site.xml:yarn.nodemanager.aux-servicesmapreduce_shuffle
hadoop@hadoop000 sbin]$ ./start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /opt/software/hadoop-2.8.1/logs/yarn-hadoop-resourcemanager-hadoop000.out
192.168.137.251: starting nodemanager, logging to /opt/software/hadoop-2.8.1/logs/yarn-hadoop-nodemanager-hadoop000.out
[hadoop@hadoop000 sbin]$
[hadoop@hadoop000 sbin]$ jps
18576 SecondaryNameNode
17793 ResourceManager
18755 Jps
17893 NodeManager
18422 DataNode
18317 NameNode
[hadoop@hadoop000 sbin]$
http://192.168.137.251:50070
http://192.168.137.251:8088
4.MapReduce2
[hadoop@hadoop000 hadoop-2.8.1]$ find ./ -name "*example*"
./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.1.jar
./share/hadoop/mapreduce/lib-examples
./share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.8.1-test-sources.jar
./share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.8.1-sources.jar
./share/doc/hadoop/api/org/apache/hadoop/examples
./share/doc/hadoop/api/org/apache/hadoop/security/authentication/examples
./share/doc/hadoop/hadoop-auth-examples
./share/doc/hadoop/hadoop-yarn/hadoop-yarn-common/apidocs/org/apache/hadoop/yarn/webapp/example
./share/doc/hadoop/hadoop-mapreduce-examples
./lib/native/examples
./etc/hadoop/ssl-client.xml.example
./etc/hadoop/ssl-server.xml.example
[hadoop@hadoop000 hadoop-2.8.1]$
app application job 作业 应用程序
[hadoop@hadoop000 hadoop-2.8.1]$ hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.1.jar pi 5 10
