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Merge from trunk to branch-2. MAPREDUCE-5920. Add Xattr option in DistCp docs. Contributed by Yi Liu. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602119 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uma Maheswara Rao G 2014-06-12 11:07:22 +00:00
parent 2f25a4f3a4
commit f089311aba
2 changed files with 3 additions and 1 deletions
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hadoop-mapreduce-project/CHANGES.txt
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@ -117,6 +117,8 @@ Release 2.5.0 - UNRELEASED
MAPREDUCE-5898. distcp to support preserving HDFS extended attributes(XAttrs)
(Yi Liu via umamahesh)
MAPREDUCE-5920. Add Xattr option in DistCp docs. (Yi Liu via cnauroth)
Release 2.4.1 - UNRELEASED
INCOMPATIBLE CHANGES

2
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/site/markdown/DistCp.md.vm
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@ -196,7 +196,7 @@ Command Line Options
Flag | Description | Notes
----------------- | ------------------------------------ | --------
`-p[rbugpca]` | Preserve r: replication number b: block size u: user g: group p: permission c: checksum-type a: ACL | Modification times are not preserved. Also, when `-update` is specified, status updates will **not** be synchronized unless the file sizes also differ (i.e. unless the file is re-created). If -pa is specified, DistCp preserves the permissions also because ACLs are a super-set of permissions.
`-p[rbugpcax]` | Preserve r: replication number b: block size u: user g: group p: permission c: checksum-type a: ACL x: XAttr | Modification times are not preserved. Also, when `-update` is specified, status updates will **not** be synchronized unless the file sizes also differ (i.e. unless the file is re-created). If -pa is specified, DistCp preserves the permissions also because ACLs are a super-set of permissions.
`-i` | Ignore failures | As explained in the Appendix, this option will keep more accurate statistics about the copy than the default case. It also preserves logs from failed copies, which can be valuable for debugging. Finally, a failing map will not cause the job to fail before all splits are attempted.
`-log <logdir>` | Write logs to \<logdir\> | DistCp keeps logs of each file it attempts to copy as map output. If a map fails, the log output will not be retained if it is re-executed.
`-m <num_maps>` | Maximum number of simultaneous copies | Specify the number of maps to copy data. Note that more maps may not necessarily improve throughput.