HDFS - DFSAdmin

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About

The DFSAdmin is a sub-command of the hdfs command line and is used for administering an HDFS cluster.

These are commands that are used only by an HDFS administrator.

Example

dfsadmin is a subcommand of hdfs

Action Command
Put the cluster in Safemode hdfs dfsadmin -safemode enter
Generate a list of DataNodes hdfs dfsadmin -report
Recommission or decommission DataNode(s) hdfs dfsadmin -refreshNodes

Documentation / Reference




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HDFS - Admin

See: Data Node Admin Guide HdfsRollingUpgrade...
Hdfs Ui Block Pool Id
HDFS - Block Pool

A block pool is a collection of block (on a datanode ???) See the options -deleteBlockPool of dfsadmin. where: Snpashot from the Overview of Snapshot from ...
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HDFS - Blockreport

A blockreport is a list of all HDFS data blocks that correspond to each of the local files, and sends this report to the NameNode. Each datanode create and send this report to the namenode: when the...
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HDFS - Cluster

An HDFS cluster consists of: a single NameNode (the head node) managing the file system. The NameNode is the arbitrator and repository for all HDFS metadata. a number of DataNodes, usually one per...
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HDFS - DataNode

A dataNode is a HDFS process that manage storage attached to the nodes that they run on. The DataNodes are responsible for serving read and write requests from the file system’s clients. The DataNodes...
Hadoop Hdfs Fsimage
HDFS - FsImage File

The HDFS file system metadata are stored in a file called the FsImage. It contains: the entire file system namespace the mapping of blocks to files and file system properties The FsImage...
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HDFS - NameNode

NameNode is an HDFS daemon that run on the head node. It' s the head process of the cluster that manages: the file system namespace and regulates access to files by clients. The NameNode: executes...
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HDFS - Snapshot

Snapshots support storing a copy of data at a particular instant of time. One usage of the snapshot feature may...



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