HDFS添加和删除节点

dfs.balance.bandwidthPerSec configuration parameter can be used to limit the number of bytes/sec each node may devote to rebalancing its data store.

dfsadmin, fsck, dfs, etc. This means that if you omit a path argument to fsck, it will not receive the -files option that you intend. You can separate common options from fsck-specific options by using -- as an argument, like so:

  bin/hadoop fsck -- -files -blocks

The -- is not required if you provide a path to start the check from, or if you specify another argument first such as -move.

By default, fsck will not operate on files still open for write by another client. A list of such files can be produced with the -openforwrite option.