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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4711) Can not change replication factor of file during moving or deleting.
Date Thu, 18 Apr 2013 20:16:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635619#comment-13635619
] 

Colin Patrick McCabe commented on HDFS-4711:
--------------------------------------------

I don't think this is a good idea.  Consider moving a large directory with hundreds of thousands
of files.  Are you going to check each file to see if its replication is equal to the current
dfs.replication setting?  And if it's not, are you going to do setrep on it?  This will also
create a lot of problems for current users, since they'll find that mv unexpectedly changes
their replication settings.  Remember that dfs.replication is usually set to a value due to
the configuration XML files, even if the user didn't set it explicitly.
                
> Can not change replication factor of file during moving or deleting.
> --------------------------------------------------------------------
>
>                 Key: HDFS-4711
>                 URL: https://issues.apache.org/jira/browse/HDFS-4711
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Vladimir Barinov
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>
> I don't know is it a feature or a bug. 
> According to hdfs dfs -help we can use key -D to set specific options for action;
> When we copying or uploading file to hdfs we can override replication factor with -D
dfs.replication=N. That's works well.
> But it doesn't work for moving or removing(to trash) file.
> Steps to reproduce:
> Uploading file
> hdfs dfs -put somefile /tmp/somefile
> Copying with changing replication:
> hdfs dfs -D dfs.replication=1 -mv /tmp/somefile /tmp/somefile2
> hadoop version:
> Hadoop 2.0.0-cdh4.1.2

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