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From Hairong Kuang <hair...@yahoo-inc.com>
Subject Re: deleting files from the DFS
Date Wed, 12 Mar 2008 17:57:47 GMT
> Case 1: Lets say there is a node which opens a file on the DFS to read. From
> my understanding, the open request will go to the namenode, which will tell
> it where the blocks of the file are. What if another node comes up and asks
> to delete that file. Of course this request will go to the namenode. How
> will the namenode respond in such a situation?
>

The namenode is stateless. So the delete request will go through. The first
request may fail.
 
> Case 2: Whenever a node wants to delete a file, I think the request first
> lands with the namenode? What happens to the replicas of the blocks of that
> file, as soon as that file gets deleted?
> 

The replicas are scheduled to be deleted by the namenode. But there may be
some delay before they are actually deleted on the datanodes.

Hairong


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