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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10741) A lightweight WebHDFS client library
Date Mon, 07 Jul 2014 20:18:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054155#comment-14054155
] 

Tsz Wo Nicholas Sze commented on HADOOP-10741:
----------------------------------------------

[~andrew.wang], this JIRA has nothing to do with standardizing the FileSystem API.  We are
not suggesting changing FileSystem API.

At this point, if we use FileSystem API, it won't be lightweight.  So we suggest adding another
lightweight API.  This API is for the users who do not want to use FileSystem API.

> A lightweight WebHDFS client library
> ------------------------------------
>
>                 Key: HADOOP-10741
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10741
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: tools
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Mohammad Kamrul Islam
>
> One of the motivations for creating WebHDFS is for applications connecting to HDFS from
outside the cluster.  In order to do so, users have to either
> # install Hadoop and use WebHdfsFileSsytem, or
> # develop their own client using the WebHDFS REST API.
> For #1, it is very difficult to manage and unnecessarily complicated for other applications
since Hadoop is not a lightweight library.  For #2, it is not easy to deal with security and
handle transient errors.
> Therefore, we propose adding a lightweight WebHDFS client as a separated library which
does not depend on Common and HDFS.  The client can be packaged as a standalone jar.  Other
applications simply add the jar to their classpath for using it.



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