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https://issues.apache.org/jira/browse/HDFS-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509283#comment-13509283
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Sanjay Radia commented on HDFS-4256:
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Since this is an addition of a *new* rpc method in clientProtocol (not a change
in signature or deletion of an existing method), wire compatibility remains and
hence the version number does not need to be bumped.
> Support for concatenation of files into a single file in branch-1
> -----------------------------------------------------------------
>
> Key: HDFS-4256
> URL: https://issues.apache.org/jira/browse/HDFS-4256
> Project: Hadoop HDFS
> Issue Type: Test
> Components: namenode
> Affects Versions: 1.2.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> HDFS-222 added support concatenation of multiple files in a directory into a
> single file. This helps several use cases where writes can be parallelized
> and several folks have expressed in this functionality.
> This jira intends to make changes equivalent from HDFS-222 into branch-1 to
> be made available release 1.2.0.
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