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https://issues.apache.org/jira/browse/HDFS-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100965#comment-13100965
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Sanjay Radia commented on HDFS-2316:
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Like hftp, Operations are processed at the NN if they involve no data
transfer. If the operation involves data transfer (r or w) then the request is
redirected to the DN. This allows bandwidth scaling and load distribution.
Alejandro has pointed out that when you redirect a put or post operation, the
initial part of the payload has been sent to the NN. I believe this is true.
Hence for writes we could consider a two request mode - getTheWrite handle
using a get and then do a put or post to the data node.
> 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
>
> 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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