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, <stu24m...@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 <rmorgan...@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.--
