您可以使用-setrep标志和hadoop fs shell命令来设置复制。

Usage: hadoop fs -setrep [-R] [-w] <numReplicas> <path>

Changes the replication factor of a file. If path is a directory then the command recursively changes the replication factor of all files under the directory tree rooted at path.

Options:

The -w flag requests that the command wait for the replication to complete. This can potentially take a very long time.
The -R flag is accepted for backwards compatibility. It has no effect.
Example:

hadoop fs -setrep -w 3 /user/hadoop/dir1

为了避免复制，可以将numreplicas设置为1。