1. 启动hadoop集群
接上个实验01，启动hadoop集群，启动结束后使用jps命令列出守护进程验证安装是否成功。
#启动HDFS
hadoop@master \~\]$ start-dfs.sh #启动Yarn \[hadoop@master \~\]$ start-yarn.sh 也可以直接使用start-all.sh启动Hadoop # master主节点： \[hadoop@master \~\]$ jps 3717 SecondaryNameNode 3855 ResourceManager 3539 NameNode 3903 JobHistoryServer 4169 Jps #slave1节点 \[hadoop@slave1 \~\]$ jps 2969 Jps 2683 DataNode 2789 NodeManager # slave2 节点 \[hadoop@slave2 \~\]$ jps 2614 Jps 2363 DataNode 2470 NodeManager 发现JobHistoryServer没有启动，所以需要执行 \[hadoop@master hadoop-2.6.0\]$ sbin/mr-jobhistory-daemon.sh start historyserver starting historyserver, logging to /home/hadoop/local/opt/hadoop-2.6.0/logs/mapred-hadoop-historyserver-master.out ## **2. HDFS** **命令** 1）新建文件夹。 hadoop fs -mkdir /user hadoop fs -mkdir /user/root 1）新建文件夹。 hadoop fs -mkdir /user hadoop fs -mkdir /user/root 2）查看文件夹权限。 # hadoop fs -ls -d /user/root drwxr-xr-x - root supergroup 0 2015-05-29 17:29 /user/root 3）上传文件。 拷贝02-上机实验/ds.txt到客户端机器，运行下面的命令和结果对照 用cp命令将ds.txt从mnt目录拷贝至hadoop-2.6.0，然后在hadoop-2.6.0目录下执行 # hadoop fs -put ds.txt /user/root/ds.txt # hadoop fs -ls -R /user/root -rw-r--r-- 3 root supergroup 9135 2015-05-29 19:07 /user/root/ds.txt 4）查看文件内容。 # hadoop fs -cat /user/root/ds.txt 17.759065824032646,0.6708203932499373 20.787886563063058,0.7071067811865472 17.944905786933322,0.5852349955359809 ...... 5）复制/移动/删除文件。 # hadoop fs -cp /user/root/ds.txt /user/root/ds_backup.txt # hadoop fs -ls /user/root Found 2 items -rw-r--r-- 3 root supergroup 9135 2015-05-29 19:07 /user/root/ds.txt -rw-r--r-- 3 root supergroup 9135 2015-05-29 19:30 /user/root/ds_backup.tx # hadoop fs -mv /user/root/ds_backup.txt /user/root/ds_backup1.txt # hadoop fs -ls /user/root Found 2 items -rw-r--r-- 3 root supergroup 9135 2015-05-29 19:07 /user/root/ds.txt -rw-r--r-- 3 root supergroup 9135 2015-05-29 19:30 /user/root/ds_backup1.txt # hadoop fs -rm -r /user/root/ds_backup1.txt 15/05/29 19:32:51 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes. Deleted /user/root/ds_backup1.txt # hadoop fs -ls /user/root Found 1 items -rw-r--r-- 3 root supergroup 9135 2015-05-29 19:07 /user/root/ds.txt