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https://issues.apache.org/jira/browse/HDFS-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566996#comment-13566996
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Tsz Wo (Nicholas), SZE commented on HDFS-3598:
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By incompatibility, it means that there are some old features not supported in
the new version. concat is a new feature. The new client will get
UnsupportedOperationException from the old server in this case.
> WebHDFS: support file concat
> ----------------------------
>
> Key: HDFS-3598
> URL: https://issues.apache.org/jira/browse/HDFS-3598
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: webhdfs
> Affects Versions: 2.0.3-alpha
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Plamen Jeliazkov
> Fix For: 2.0.3-alpha
>
> Attachments: HDFS-3598.trunk.2.patch, HDFS-3598.trunk.patch
>
>
> In trunk and branch-2, DistributedFileSystem has a new concat(Path trg, Path
> [] psrcs) method. WebHDFS should support it.
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