第128讲:Hadoop集群管理工具dfsadmin实战详解学习笔记
通过dfsadmin可以查看hdfs的一些信息也可以执行一些管理操作。
要想使用dfsadmin需要有管理员权限,因为dfsadmin可以修改hdfs的内容。
使用hadoop dfsadmin命令可以显示帮助 。
hadoop dfsadmin -report 统计信息,可以查看 datanode的IP,心跳信息等。
hadoop dfsadmin
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead usr the hdfs command for it.
Usage: hdfs dfsadmin
Note:Administrative commands can only be run as the HDFS superuser.
[-report [-live] [-dead] [-decommissioning]]
[-safemode <enter | leave | get | wait>]
[saveNodespace]
[roolEdits]
[restoreFailedStorage true | false|check]
[-refreshNodes]
[-setQuota <quota> <dirname>...<dirname>]
[-clrQuota <dirname>...<dirname>]
[finalizeUpgrade]
[rollingUpgrade [<query|prepare|finalize>]]
[-refreshServiceAcl]
[refreshUserToGroupMappings]
[-refreshSuperUserGroupsConfiguration]
[-refreshCallQueue]
[-refresh <host: ipc_port> <key> <arg1..argn>]
[-reconfig <dataname|...> <host: ipc_port> <start|status>]
[printTopology]
[-refreshNamenodes datanode_host: ipc_port]
[-deleteBlickpool datanode_host: ipc_port blockpoolId[force]]
[-setBalancerBandwidth <bandwidth in bytes per sencond>]
[-fetchImage <local directory>]
[-allowSnapshot <snapshotDir>]
[-disallowSnashot <snapshotDir>]
[shutdownDatanode <datanode_host: ipc_port> [upgrade]]
[getDatanodeInfo <datanode_host: ipc_port>]
[-metasave filename]
[-setStoragePolicy path policyName]
[-getStoragePolicy path]