[jira] Commented: (HADOOP-438) DFS pathname limitation.

["Wendy Chien (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/HADOOP-438?page=comments#action_12433010 ] 
            
Wendy Chien commented on HADOOP-438:
------------------------------------

To fix this we're going to enforce a pathname limit in the Path class constructor. .  (8K in length and 1K in depth.)   The constructor will throw an exception which will be passed back to the client. 

> DFS pathname limitation.
> ------------------------
>
>                 Key: HADOOP-438
>                 URL: http://issues.apache.org/jira/browse/HADOOP-438
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.5.0, 0.4.0, 0.3.2, 0.3.1, 0.3.0, 0.2.1, 0.2.0, 0.1.1, 0.1.0
>            Reporter: Konstantin Shvachko
>             Fix For: 0.6.0
>
>
> I was trying to create a deep hierarchy of directories using DFS mkdirs().
> When the path to the leaf directory became long (~20000) DFS was still able to create
> directories with these names, but UTF8 started truncating long strings resulting in
> incorrect logging of namespace edits. That later crashed the namenode during restart,
> when it was trying to reproduce file creation logged in the edits file with truncated names.
> UTF8 is deprecated now so we will have to replace it with Text.
> With UTF8  we should enforce a pathname limit of 0xffff/3 = 21845
> With Text it is going to be larger. Not sure what the exact number is.

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