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https://issues.apache.org/jira/browse/HDFS-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133237#comment-13133237
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Tsz Wo (Nicholas), SZE commented on HDFS-2316:
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*Thanks everyone for looking at the webhdfs API.* I will update the doc
accordingly. Sorry the json types and error responses are missing. Below are
some quick responses:
> 4. case sensitivity - make the parameters lower case rather than have the
> filter convert them since pathname and the user name should not be converted.
Only the parameter names are case insensitive. The parameter values are case
sensitive except for op values and boolean values.
> Permission masks are currently octal in webhdfs and symbolic in hoop. IMO, it
> should make sense to support both.
I thought about adding chmod style symbolic permission. However, it does not
make sense in webhdfs SETPERMISSION since it only sets absolute permission
(e.g. "u=rwx,go=rx", which equals 755.) The relative permissions (e.g. "go-w")
won't work. Hoop uses ls output style for setting permission (e.g. rwxr-xr-x).
This seems uncommon.
> File ranges, webhdfs uses HTTP 'content-ranges' header, ...
I have implemented OPEN with offset and length parameters but decide to change
it since it is not following the http spec. Won't it cause problems if webhdfs
does follow the http spec?
> 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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