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From Rita <rmorgan...@gmail.com>
Subject Re: how does hdfs determine what node to use?
Date Thu, 10 Mar 2011 13:37:08 GMT
Thanks Stu. I too was sure there was an algorithm. Is there a place where I
can read more about it?  I want to know if it picks a block according to the
load average or does it always pick "rack0" first?



On Wed, Mar 9, 2011 at 10:24 PM, <stu24mail@yahoo.com> wrote:

> There is an algorithm. Each block should have a copy on different nodes. In
> your case, each block will have a copy on each of the nodes.
>
> Take care,
> -stu
> ------------------------------
> *From: * Rita <rmorgan466@gmail.com>
> *Date: *Wed, 9 Mar 2011 22:07:37 -0500
> *To: *<hdfs-user@hadoop.apache.org>
> *ReplyTo: * hdfs-user@hadoop.apache.org
> *Subject: *how does hdfs determine what node to use?
>
> I have a 2 rack cluster. All of my files have a replication factor of 2.
> How does hdfs determine what node to use when serving the data? Does it
> always use the first rack? or is there an algorithm for this?
>
>
> --
> --- Get your facts first, then you can distort them as you please.--
>



-- 
--- Get your facts first, then you can distort them as you please.--

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