secondarynamenode run the DFS secondary namenode namenode run the DFS namenode journalnode run the DFS journalnode zkfc run the ZK Failover Controller daemon datanode run a DFS datanode debug run a Debug Admin to execute HDFS debug commands dfsadmin run a DFS admin client dfsrouter run the DFS...
[root@hadoop101.yinzhengjie.com~]# hdfs dfsadmin Usage: hdfs dfsadmin Note: Administrative commands can only be run as the HDFS superuser. [-report [-live] [-dead] [-decommissioning] [-enteringmaintenance] [-inmaintenance]] [-safemode <enter | leave | get |wait>] [-saveNamespace] [-...
(5) /test/chqz/input:传递给WordCount类,作为DFS文件系统的路径,指示输入数据来源。 (6) /test/chqz/output:传递给WordCount类,作为DFS文件系统的路径,指示输出数据路径。 hadoop推荐使用yarn jar替代hadoop jar 详情见:http://hadoop.apache.org/docs/r2.8.0/hadoop-yarn/hadoop-yarn-site/YarnCommands.html#...
(5) /test/chqz/input:传递给WordCount类,作为DFS文件系统的路径,指示输入数据来源。 (6) /test/chqz/output:传递给WordCount类,作为DFS文件系统的路径,指示输出数据路径。 hadoop推荐使用yarn jar替代hadoop jar 详情见:http://hadoop.apache.org/docs/r2.8.0/hadoop-yarn/hadoop-yarn-site/YarnCommands.html#...
上接前两篇,再来分析下下载文件的过程hdfs dfs -get 或 hdfs dfs -copyToLocal 先找到命令get和copyToLocal对应的类 publicstaticvoidregisterCommands(CommandFactoryfactory){factory.registerCommands(AclCommands.class);factory.registerCommands(CopyCommands.class);factory.registerCommands(Count.class);factory.regist...
Note: Administrative commands can only be run as the HDFS superuser. [-report [-live] [-dead] [-decommissioning]] [-safemode <enter | leave | get | wait>] [-saveNamespace] [-rollEdits] [-restoreFailedStorage true|false|check]
dfsrouteradmin journalnode mover namenode nfs3 portmap secondarynamenode storagepolicies zkfc Debug Commands verifyMeta computeMeta recoverLease 概述 所有的hadoop命令均由bin/hadoop脚本引发。不指定参数运行hadoop脚本会打印所有命令的描述。 用法: hadoop [--config confdir] [COMMAND] [GENERIC_OPTIONS] [COMMAN...
dfs.hosts, dfs.hosts.exclude configuration parameters.Hosts defined in dfs.hosts are the datanodes that are part of the cluster. If there are entries in dfs.hosts, only the hosts in it are allowed to register with the namenode.Entries in dfs.hosts.exclude are datanodes that need to be dec...
发现hdfs dfsadmin -report存储指标和hdfs dfs -du -h /结果不一致,需要查看两张的统计逻辑的区别 确定命令的位置,which is hdfs [ops@m-onedata bin]$ which is hdfs /usr/bin/hdfs 查看脚本,cat /usr/bin/hdfs exec /usr/.../hadoop-hdfs/bin/hdfs.distro "$@" ...
HDFS是一个文件系统,它遵循了与Linux类似的POSIX标准,所以有类似于linux的shell命令行操作接口(命令)。主要提供了User Commands、Admin Commands以及Debug Commands: HDFS命令 常用的用户命令有dfs、fsck,下面举个例子: 1.查看根目录下的文件列表 hdfs dfs -ls / ...