Mailing-List: contact core-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: core-dev@hadoop.apache.org
Received-SPF: pass (athena.apache.org: local policy)
DomainKey-Signature: a=rsa-sha1; s=serpent; d=yahoo-inc.com; c=nofws; q=dns;
	h=mime-version:in-reply-to:references:content-type:message-id:from:
	subject:date:to:x-mailer;
	b=x/TbwH35Kgx3n0jwLG36VbGU4nJrK4K69SjXAIhO1O513g6bfpAl76kD7SqKfaOo
Mime-Version: 1.0 (Apple Message framework v753)
In-Reply-To: <96d3bba10802271044v1b2414cbg10468a8b41d5a7a0@mail.gmail.com>
References: <96d3bba10802251007x77888988i76bb71c88d238720@mail.gmail.com>
 <96d3bba10802271044v1b2414cbg10468a8b41d5a7a0@mail.gmail.com>
Content-Type: multipart/alternative; boundary=Apple-Mail-3-346097706
Message-Id: <71F57B41-F995-476B-B931-C4F353F0A013@yahoo-inc.com>
From: Arun C Murthy <acm@yahoo-inc.com>
Subject: Re: libhdfs v.s. hadoop's hdfs
Date: Wed, 27 Feb 2008 11:04:40 -0800
To: core-dev@hadoop.apache.org

--Apple-Mail-3-346097706
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
	charset=US-ASCII;
	delsp=yes;
	format=flowed

Ahmad,

On Feb 27, 2008, at 10:44 AM, Ahmad Humayun wrote:

> Hello everyone,
>
> Apparently no one knew the answer to my question :( Am I looking at  
> things
> the right way or nobody has compared the libhdfs code to hdfs? Or am I
> completely wrong, libhdfs and hdfs has no difference at all?
>

libhdfs is a JNI-based wrapper around hdfs, so it invokes the  
underlying java apis via JNI. It offers most of the functionality of  
hdfs, but I'm not sure it has everything.

The hdfs java api is here:
http://hadoop.apache.org/core/docs/r0.16.0/api/org/apache/hadoop/fs/ 
FileSystem.html

Arun

> regards,
>
> On Mon, Feb 25, 2008 at 11:07 PM, Ahmad Humayun  
> <ahmad.humyn@gmail.com>
> wrote:
>
>> Hi there,
>>
>> I was just playing with libhdfs and couldnt help see the  
>> differences it
>> has with the hadoop.dfs package. The hadoop.dfs seems to be much more
>> intensive then ifs c++ counterpart, libhdfs, on the amount of  
>> functionality
>> it offers. Hmm.. am I wrong here?....am I looking at things the  
>> wrong way?
>> Is libhdfs is cut-down part of hadoop.dfs. If so, what  
>> functionality I'll
>> miss out on by using libhdfs.
>>
>> Which files in the hadoop.dfs package provide similar functions as
>> libhdfs. In other words where in the dfs package I should look for an
>> "apples to apples" comparison with the libhdfs.
>>
>>
>> thanks,
>> --
>> Ahmad Humayun
>> Research Assistant
>> Computer Science Dpt., LUMS
>> +92 321 4457315
>
>
>
>
> -- 
> Ahmad Humayun
> Research Assistant
> Computer Science Dpt., LUMS
> +92 321 4457315


--Apple-Mail-3-346097706--