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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5293) Symlink resolution requires unnecessary RPCs
Date Thu, 12 May 2016 22:25:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282169#comment-15282169
] 

Sangjin Lee commented on HDFS-5293:
-----------------------------------

There has been no movement on this for a while. We'll need to move it out of scope for 2.8.0
soon. Let me know if you disagree.

> Symlink resolution requires unnecessary RPCs
> --------------------------------------------
>
>                 Key: HDFS-5293
>                 URL: https://issues.apache.org/jira/browse/HDFS-5293
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0-alpha1
>            Reporter: Daryn Sharp
>            Priority: Critical
>
> When the NN encounters a symlink, it throws an {{UnresolvedLinkException}}.  This exception
contains only the path that is a symlink.  The client issues another RPC to obtain the link
target, followed by another RPC with the link target + remainder of the original path.
> {{UnresolvedLinkException}} should be returning both the link and the target to avoid
a costly and unnecessary intermediate RPC to obtain the link target.



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