Hadoop File Copy command

Source: Internet
Author: User
Tags file copy

Hadoop's built-in DISTCP command, which replicates files in a map-reduce way, is very effective for copying large data folders, especially folders.

You do not need to manually specify the underlying folder to complete the replication. and the copied result file is the same as the source file name, and there is no case of part-* file.

However, for small data files, it is recommended to use the Hadoop built-in FS-CP command, when Hadoop is more congested, start a map-reduce process will become very slow, which reflects the advantages of CP, directly complete the file copy, reduce the distcp because of the start map, Reduce the delay caused by file replication.

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