[jira] [Updated] (HADOOP-14137) Faster distcp by taking file list from fsimage or -lsr result

["Zheng Shao (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-14137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zheng Shao updated HADOOP-14137:
--------------------------------
    Summary: Faster distcp by taking file list from fsimage or -lsr result  (was: Allow DistCp to take a file list within a src directory)

> Faster distcp by taking file list from fsimage or -lsr result
> -------------------------------------------------------------
>
>                 Key: HADOOP-14137
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14137
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: tools/distcp
>            Reporter: Zheng Shao
>
> DistCp is very slow to start when the src directory has a huge number of subdirectories.  In our case, we already have the directory listing (via "hdfs oiv -i fsimage" or via nightly "hdfs dfs -lr -r /" dumps), and we would like to use that instead of doing realtime listing on the NameNode.
> The "-f" option doesn't help in this case because it would try to put everything into a single flat target directory.
> We'd like to introduce a new option "-list <file>" for distcp.  The <file> contains the result of listing the src directory.
> In order to achieve this, we plan to:
> 1. Add a new CopyListing class PregeneratedCopyListing similar to SimpleCopyListing which doesn't "-ls -r" into the directory, but takes the listing via "-list"
> 2. Add an option "-list <file>" which will automatically make distcp use the new PregeneratedCopyListing class.



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