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https://issues.apache.org/jira/browse/HDFS-222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756715#action_12756715
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Doug Cutting commented on HDFS-222:
-----------------------------------
This sounds good to me.
It might be simplest if the source were removed and the entire operation is
atomic, e.g., if it succeeds then the source is gone and if it fails the
destination is unchanged and the source is still present. There is no middle
ground.
Also, what happens if the target already exists? Should we add an overwrite
option? If this is unspecified and the target exists then an error is thrown.
If it is specified, and the target is a plain file, then the old target's
blocks are removed as a part of the atomic operation. If the old target is a
directory an error is thrown regardless of overwrite.
(Can you guess which issue I've been following?)
> Support for concatenating of files into a single file
> -----------------------------------------------------
>
> Key: HDFS-222
> URL: https://issues.apache.org/jira/browse/HDFS-222
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Venkatesh S
> Assignee: Boris Shkolnik
>
> An API to concatenate files of same size and replication factor on HDFS into
> a single larger file.
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