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https://issues.apache.org/jira/browse/HDFS-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563090#comment-13563090
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Tsz Wo (Nicholas), SZE commented on HDFS-3598:
----------------------------------------------
In order to use some DFS specific operations such as concat, setSafeMode, etc.,
we have to cast FileSystem to DistributedFileSystem and then call the
DistributedFileSystem methods. e.g.
{code}
//uri scheme must be hdfs://
DistributedFileSystem dfs = (DistributedFileSystem)FileSystem.get(uri);
dfs.concat(..);
{code}
If there are common operations available in both DistributedFileSystem and
WebHdfsFileSystem. Then, adding HadoopDistributedFileSystem allows code to
support both hdfs:// or webhdfs:// URIs.
{code}
//uri scheme could be hdfs:// or webhdfs://
HadoopDistributedFileSystem hdfs =
(HadoopDistributedFileSystem)FileSystem.get(uri);
hdfs.concat(..);
{code}
> WebHDFS: support file concat
> ----------------------------
>
> Key: HDFS-3598
> URL: https://issues.apache.org/jira/browse/HDFS-3598
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Plamen Jeliazkov
>
> In trunk and branch-2, DistributedFileSystem has a new concat(Path trg, Path
> [] psrcs) method. WebHDFS should support it.
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