hadoop distcp 参数详解

# hadoop distcp 
usage: distcp OPTIONS [source_path...]
              OPTIONS
 -append                       Reuse existing data in target files and
                               append new data to them if possible
 -async                        Should distcp execution be blocking
 -atomic                       Commit all changes or none
 -bandwidth               Specify bandwidth per map in MB
 -delete                       Delete from target, files missing in source
 -diff                    Use snapshot diff report to identify the
                               difference between source and target
 -f                       List of files that need to be copied
 -filelimit               (Deprecated!) Limit number of files copied
                               to <= n
 -filters                 The path to a file containing a list of
                               strings for paths to be excluded from the
                               copy.
 -i                            Ignore failures during copy
 -log                     Folder on DFS where distcp execution logs
                               are saved
 -m                       Max number of concurrent maps to use for
                               copy
 -mapredSslConf           Configuration for ssl config file, to use
                               with hftps://. Must be in the classpath.
 -numListstatusThreads    Number of threads to use for building file
                               listing (max 40).
 -overwrite                    Choose to overwrite target files
                               unconditionally, even if they exist.
 -p                       preserve status (rbugpcaxt)(replication,
                               block-size, user, group, permission,
                               checksum-type, ACL, XATTR, timestamps). If
                               -p is specified with no , then
                               preserves replication, block size, user,
                               group, permission, checksum type and
                               timestamps. raw.* xattrs are preserved when
                               both the source and destination paths are
                               in the /.reserved/raw hierarchy (HDFS
                               only). raw.* xattrpreservation is
                               independent of the -p flag. Refer to the
                               DistCp documentation for more details.
 -sizelimit               (Deprecated!) Limit number of files copied
                               to <= n bytes
 -skipcrccheck                 Whether to skip CRC checks between source
                               and target paths.
 -strategy                Copy strategy to use. Default is dividing
                               work based on file sizes
 -tmp                     Intermediate work path to be used for
                               atomic commit
 -update                       Update target, copying only missingfiles or
                               directories