目录
正文 Hadoop常用命令启动HDFS集群[hadoop@hadoop1 ~]$ start-dfs.sh Starting namenodes on [hadoop1] hadoop1: starting namenode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-namenode-hadoop1.out hadoop2: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop2.out hadoop3: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop3.out hadoop4: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop4.out hadoop1: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop1.out Starting secondary namenodes [hadoop3] hadoop3: starting secondarynamenode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-secondarynamenode-hadoop3.out [hadoop@hadoop1 ~]$ 启动YARN集群[hadoop@hadoop4 ~]$ start-yarn.sh starting yarn daemons starting resourcemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-resourcemanager-hadoop4.out hadoop2: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop2.out hadoop3: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop3.out hadoop4: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop4.out hadoop1: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop1.out [hadoop@hadoop4 ~]$ 查看HDFS系统根目录[hadoop@hadoop1 ~]$ hadoop fs -ls / Found 2 items drwxr-xr-x - hadoop supergroup 0 2018-03-03 11:42 /test drwx------ - hadoop supergroup 0 2018-03-03 11:42 /tmp [hadoop@hadoop1 ~]$ 创建文件夹[hadoop@hadoop1 ~]$ hadoop fs -mkdir /a [hadoop@hadoop1 ~]$ hadoop fs -ls / Found 3 items drwxr-xr-x - hadoop supergroup 0 2018-03-08 11:09 /a drwxr-xr-x - hadoop supergroup 0 2018-03-03 11:42 /test drwx------ - hadoop supergroup 0 2018-03-03 11:42 /tmp [hadoop@hadoop1 ~]$ 级联创建文件夹[hadoop@hadoop1 ~]$ hadoop fs -mkdir -p /aa/bb/cc [hadoop@hadoop1 ~]$ 查看hsdf系统根目录下的所有文件包括子文件夹里面的文件[hadoop@hadoop1 ~]$ hadoop fs -ls -R /aa 上传文件[hadoop@hadoop1 ~]$ ls 下载文件[hadoop@hadoop1 ~]$ hadoop fs -get /aa/words.txt ~/newwords.txt [hadoop@hadoop1 ~]$ ls apps data newwords.txt words.txt [hadoop@hadoop1 ~]$ hadoop fs -copyToLocal /aa/words.txt ~/newwords1.txt [hadoop@hadoop1 ~]$ ls apps data newwords1.txt newwords.txt words.txt [hadoop@hadoop1 ~]$ 合并下载[hadoop@hadoop1 ~]$ hadoop fs -getmerge /aa/words.txt /aa/bb/words.txt ~/2words.txt [hadoop@hadoop1 ~]$ ll 总用量 24 -rw-r--r--. 1 hadoop hadoop 78 3月 8 12:42 2words.txt drwxrwxr-x. 3 hadoop hadoop 4096 3月 3 10:30 apps drwxrwxr-x. 3 hadoop hadoop 4096 3月 3 11:40 data -rw-r--r--. 1 hadoop hadoop 39 3月 8 11:49 newwords1.txt -rw-r--r--. 1 hadoop hadoop 39 3月 8 11:48 newwords.txt -rw-rw-r--. 1 hadoop hadoop 39 3月 3 11:31 words.txt [hadoop@hadoop1 ~]$ 复制从HDFS一个路径拷贝到HDFS另一个路径 [hadoop@hadoop1 ~]$ hadoop fs -ls /a [hadoop@hadoop1 ~]$ hadoop fs -cp /aa/words.txt /a [hadoop@hadoop1 ~]$ hadoop fs -ls /a Found 1 items -rw-r--r-- 2 hadoop supergroup 39 2018-03-08 12:46 /a/words.txt [hadoop@hadoop1 ~]$ 移动在HDFS目录中移动文件 [hadoop@hadoop1 ~]$ hadoop fs -ls /aa/bb/cc [hadoop@hadoop1 ~]$ hadoop fs -mv /a/words.txt /aa/bb/cc [hadoop@hadoop1 ~]$ hadoop fs -ls /aa/bb/cc Found 1 items -rw-r--r-- 2 hadoop supergroup 39 2018-03-08 12:46 /aa/bb/cc/words.txt [hadoop@hadoop1 ~]$ 删除删除文件或文件夹 [hadoop@hadoop1 ~]$ hadoop fs -rm /aa/bb/cc/words.txt 18/03/08 12:49:08 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes. Deleted /aa/bb/cc/words.txt [hadoop@hadoop1 ~]$ hadoop fs -ls /aa/bb/cc [hadoop@hadoop1 ~]$ 删除空目录 [hadoop@hadoop1 ~]$ hadoop fs -rmdir /aa/bb/cc/ [hadoop@hadoop1 ~]$ hadoop fs -ls /aa/bb/ Found 1 items -rw-r--r-- 2 hadoop supergroup 39 2018-03-08 11:43 /aa/bb/words.txt [hadoop@hadoop1 ~]$ 强制删除 [hadoop@hadoop1 ~]$ hadoop fs -rm /aa/bb/ rm: `/aa/bb': Is a directory [hadoop@hadoop1 ~]$ hadoop fs -rm -r /aa/bb/ 18/03/08 12:51:31 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes. Deleted /aa/bb [hadoop@hadoop1 ~]$ hadoop fs -ls /aa Found 1 items -rw-r--r-- 2 hadoop supergroup 39 2018-03-08 11:41 /aa/words.txt [hadoop@hadoop1 ~]$ 从本地剪切文件到HDFS上[hadoop@hadoop1 ~]$ ls apps data hello.txt [hadoop@hadoop1 ~]$ hadoop fs -moveFromLocal ~/hello.txt /aa [hadoop@hadoop1 ~]$ ls apps data [hadoop@hadoop1 ~]$ 追加文件追加之前hello.txt到words.txt之前 [hadoop@hadoop1 ~]$ hadoop fs -appendToFile ~/hello.txt /aa/words.txt [hadoop@hadoop1 ~]$ 追加之前hello.txt到words.txt之后 查看文件内容[hadoop@hadoop1 ~]$ hadoop fs -cat /aa/hello.txt hello hello hello [hadoop@hadoop1 ~]$ chgrp使用方法:hadoop fs -chgrp [-R] GROUP URI [URI …] Change group association of files. With -R, make the change recursively through the directory structure. The user must be the owner of files, or else a super-user. Additional information is in the Permissions User Guide. --> 改变文件所属的组。使用-R将使改变在目录结构下递归进行。命令的使用者必须是文件的所有者或者超级用户。更多的信息请参见HDFS权限用户指南。 chmod使用方法:hadoop fs -chmod [-R] <MODE[,MODE]... | OCTALMODE> URI [URI …] 改变文件的权限。使用-R将使改变在目录结构下递归进行。命令的使用者必须是文件的所有者或者超级用户。更多的信息请参见HDFS权限用户指南。 chown使用方法:hadoop fs -chown [-R] [OWNER][:[GROUP]] URI [URI ] 改变文件的拥有者。使用-R将使改变在目录结构下递归进行。命令的使用者必须是超级用户。更多的信息请参见HDFS权限用户指南。 du使用方法:hadoop fs -du URI [URI …] 显示目录中所有文件的大小,或者当只指定一个文件时,显示此文件的大小。 dus使用方法:hadoop fs -dus <args> 显示文件的大小。 expunge使用方法:hadoop fs -expunge 清空回收站。请参考HDFS设计文档以获取更多关于回收站特性的信息。 setrep使用方法:hadoop fs -setrep [-R] <path> 改变一个文件的副本系数。-R选项用于递归改变目录下所有文件的副本系数。 示例:
返回值: 成功返回0,失败返回-1。 tail使用方法:hadoop fs -tail [-f] URI 将文件尾部1K字节的内容输出到stdout。支持-f选项,行为和Unix中一致。 示例:
返回值: test使用方法:hadoop fs -test -[ezd] URI 选项: 示例:
查看集群的工作状态[hadoop@hadoop1 ~]$ hdfs dfsadmin -report Configured Capacity: 73741402112 (68.68 GB) Present Capacity: 52781039616 (49.16 GB) DFS Remaining: 52780457984 (49.16 GB) DFS Used: 581632 (568 KB) DFS Used%: 0.00% Under replicated blocks: 0 Blocks with corrupt replicas: 0 Missing blocks: 0 Missing blocks (with replication factor 1): 0 ------------------------------------------------- Live datanodes (4): Name: 192.168.123.102:50010 (hadoop1) Hostname: hadoop1 Decommission Status : Normal Configured Capacity: 18435350528 (17.17 GB) DFS Used: 114688 (112 KB) Non DFS Used: 4298661888 (4.00 GB) DFS Remaining: 13193277440 (12.29 GB) DFS Used%: 0.00% DFS Remaining%: 71.57% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Thu Mar 08 13:05:11 CST 2018 Name: 192.168.123.105:50010 (hadoop4) Hostname: hadoop4 Decommission Status : Normal Configured Capacity: 18435350528 (17.17 GB) DFS Used: 49152 (48 KB) Non DFS Used: 4295872512 (4.00 GB) DFS Remaining: 13196132352 (12.29 GB) DFS Used%: 0.00% DFS Remaining%: 71.58% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Thu Mar 08 13:05:13 CST 2018 Name: 192.168.123.103:50010 (hadoop2) Hostname: hadoop2 Decommission Status : Normal Configured Capacity: 18435350528 (17.17 GB) DFS Used: 233472 (228 KB) Non DFS Used: 4295700480 (4.00 GB) DFS Remaining: 13196120064 (12.29 GB) DFS Used%: 0.00% DFS Remaining%: 71.58% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Thu Mar 08 13:05:11 CST 2018 Name: 192.168.123.104:50010 (hadoop3) Hostname: hadoop3 Decommission Status : Normal Configured Capacity: 18435350528 (17.17 GB) DFS Used: 184320 (180 KB) Non DFS Used: 4296941568 (4.00 GB) DFS Remaining: 13194928128 (12.29 GB) DFS Used%: 0.00% DFS Remaining%: 71.57% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Thu Mar 08 13:05:10 CST 2018 [hadoop@hadoop1 ~]$
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