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https://issues.apache.org/jira/browse/HDFS-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143459#comment-13143459
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Tsz Wo (Nicholas), SZE commented on HDFS-2316:
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> FileStatus JSON payload has elements that are not part of the FileStatus
> interface. The WebhdfsFileSystem client expects those elements and fails if
> they are not present. These elements are: localName, isSymlink, symlink.
> These elements are not later used and they are lost when creating a
> FileStatus in WebhdfsFileSystem. Either those elements should not be in JSON
> payload (my preference) or they should not be required by the
> WebhdfsFileSystem.
localName is for reducing the response size. It does not include the path
prefix. Otherwise, the same path prefix have to be sent for each status. It
becomes a problem if the number of statuses is huge.
symlink it in 0.23. It is a bug that it is not used.
> delete, rename, mkdirs, setReplication JSON responses use 'boolean' as
> element name, they should use the operation name as it is more descriptive.
Similar to other responses, they need a root element. The key of the root
element is the type/class. Then, the client can determine how to parse the
JSON object by checking the key.
> FileChecksum JSON serialization is using the classname in the JSON payload,
> it should not, ...
The classname is the root element. It is required by other format such as xml.
> webhdfs: a complete FileSystem implementation for accessing HDFS over HTTP
> --------------------------------------------------------------------------
>
> Key: HDFS-2316
> URL: https://issues.apache.org/jira/browse/HDFS-2316
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: WebHdfsAPI20111020.pdf
>
>
> We current have hftp for accessing HDFS over HTTP. However, hftp is a
> read-only FileSystem and does not provide "write" accesses.
> In HDFS-2284, we propose to have webhdfs for providing a complete FileSystem
> implementation for accessing HDFS over HTTP. The is the umbrella JIRA for
> the tasks.
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