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From Amandeep Khurana <ama...@gmail.com>
Subject Re: HDFS architecture based on GFS?
Date Sun, 15 Feb 2009 21:36:06 GMT
Thanks Matie

I had gone through the architecture document online. I am currently working
on a project towards Security in Hadoop. I do know how the data moves around
in the GFS but wasnt sure how much of that does HDFS follow and how
different it is from GFS. Can you throw some light on that?

Security would also involve the Map Reduce jobs following the same
protocols. Thats why the question about how does the Hadoop framework
integrate with the HDFS, and how different is it from Map Reduce and GFS.
The GFS and Map Reduce papers give a good information on how those systems
are designed but there is nothing that concrete for Hadoop that I have been
able to find.


Amandeep Khurana
Computer Science Graduate Student
University of California, Santa Cruz

On Sun, Feb 15, 2009 at 12:07 PM, Matei Zaharia <matei@cloudera.com> wrote:

> Hi Amandeep,
> Hadoop is definitely inspired by MapReduce/GFS and aims to provide those
> capabilities as an open-source project. HDFS is similar to GFS (large
> blocks, replication, etc); some notable things missing are read-write
> support in the middle of a file (unlikely to be provided because few Hadoop
> applications require it) and multiple appenders (the record append
> operation). You can read about HDFS architecture at
> http://hadoop.apache.org/core/docs/current/hdfs_design.html. The MapReduce
> part of Hadoop interacts with HDFS in the same way that Google's MapReduce
> interacts with GFS (shipping computation to the data), although Hadoop
> MapReduce also supports running over other distributed filesystems.
> Matei
> On Sun, Feb 15, 2009 at 11:57 AM, Amandeep Khurana <amansk@gmail.com>
> wrote:
> > Hi
> >
> > Is the HDFS architecture completely based on the Google Filesystem? If it
> > isnt, what are the differences between the two?
> >
> > Secondly, is the coupling between Hadoop and HDFS same as how it is
> between
> > the Google's version of Map Reduce and GFS?
> >
> > Amandeep
> >
> >
> > Amandeep Khurana
> > Computer Science Graduate Student
> > University of California, Santa Cruz
> >

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