[jira] Commented: (HADOOP-3873) DistCp should have an option for limiting the number of files/bytes being copied

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618510#action_12618510 ] 

Doug Cutting commented on HADOOP-3873:
--------------------------------------

This sounds rather ad-hoc.  What is the use case?

In most cases, the total size to be copied can be determined up front, before the copying begins, no?

What might be better is a mechanism to stop a DistCp job.  E.g., one could provide a "stop" file name.  When this is non-null, copying will stop as soon as the named file exists.  Might that meet the need here?

> DistCp should have an option for limiting the number of files/bytes being copied
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-3873
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3873
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: tools/distcp
>            Reporter: Tsz Wo (Nicholas), SZE
>
> A single DistCp command may potentially copies a huge number of files/bytes.  In such case, DistCp will run a long time and there is no way stop it nicely.  It would be good if DistCp have an option to limit the number of files/bytes being copied.  Once the limit is reached, DistCp will terminate and return success.  All files copied are guaranteed to be good and there is no partially copied file.

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