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Date: Wed, 30 Jul 2008 11:37:38 -0700
From: Raghu Angadi <rangadi@yahoo-inc.com>
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To: core-user@hadoop.apache.org
Subject: Re: NameNode HA
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Himanshu Sharma wrote:
> The "dfs.name.dir" attribute, if given a comma-delimited list of directories,
> replicates the name table in all such directories for redundancy.
> 
> My question is : whether it does so synchronously or asynchronously i.e does
> it make sure that for each entry in EditLog file, all such replicated files
> get an entry before that operation is termed as completed ?

synchronously. All the files get the entry before the operation is 
considered complete.

Raghu.