RE: Block placement without rack aware

[Liu, Yi A]

It’s still random.
If rack aware is not enabled, all nodes are in “default-rack”, and random nodes 
are chosen for block replications.

Regards,
Yi Liu

From: SF Hadoop [mailto:sfhad...@gmail.com]
Sent: Friday, October 03, 2014 7:12 AM
To: user@hadoop.apache.org
Subject: Block placement without rack aware

What is the block placement policy hadoop follows when rack aware is not 
enabled?

Does it just round robin?

Thanks.

Re: Block placement without rack aware

[Pradeep Gollakota]

It appears to be randomly chosen. I just came across this blog post from
Lars George about HBase file locality in HDFS
http://www.larsgeorge.com/2010/05/hbase-file-locality-in-hdfs.html

On Thu, Oct 2, 2014 at 4:12 PM, SF Hadoop sfhad...@gmail.com wrote:

 What is the block placement policy hadoop follows when rack aware is not
 enabled?

 Does it just round robin?

 Thanks.

Re: Block placement without rack aware

[SF Hadoop]

Thanks for the info.  Exactly what I needed.

Cheers.

On Thu, Oct 2, 2014 at 4:21 PM, Pradeep Gollakota pradeep...@gmail.com
wrote:

 It appears to be randomly chosen. I just came across this blog post from
 Lars George about HBase file locality in HDFS
 http://www.larsgeorge.com/2010/05/hbase-file-locality-in-hdfs.html

 On Thu, Oct 2, 2014 at 4:12 PM, SF Hadoop sfhad...@gmail.com wrote:

 What is the block placement policy hadoop follows when rack aware is not
 enabled?

 Does it just round robin?

 Thanks.