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Posted to common-user@hadoop.apache.org by vikas <pv...@gmail.com> on 2008/05/04 16:51:51 UTC

Hoe to perform FILE IO with Hadoop DFS

Hi All,

can any one please help me with the technique of writing to the same file in
DFS of Hadoop.

I want to perform insertion, deletion and update on the file of my DFS.

 So how can I get the write access to the file already created. and what is
the best way to update a file.


Thank You,
-Vikas.

Re: Hoe to perform FILE IO with Hadoop DFS

Posted by Arun C Murthy <ar...@yahoo-inc.com>.

Vikas,

On May 4, 2008, at 7:51 AM, vikas wrote:

> Hi All,
>
> can any one please help me with the technique of writing to the  
> same file in
> DFS of Hadoop.
>
> I want to perform insertion, deletion and update on the file of my  
> DFS.
>

HDFS doesn't support file-updates, once written (i.e. after the file  
is 'closed') the file is immutable.

Appends to a file are coming soon: http://issues.apache.org/jira/ 
browse/HADOOP-3149.

Arun