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https://issues.apache.org/jira/browse/HADOOP-3873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621032#action_12621032
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Raghu Angadi commented on HADOOP-3873:
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This is a useful feature. Hopefully documentation clearly defines what users
can expect.
One question : extending the example in the 2nd commend above, what happens if
/user1/data/file1 is deleted on the source before the second day? will it be
deleted on the destination? If yes, may be some option like "-sync" will make
it more clear to the user (of course "-sizelimit" etc still apply).
In the long term, once we can preserve modification times and other metadata
while copying, it might be better to add "rsync" mode to distcp.
> 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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