@Steve Severance It seems your email bounced on almost everyone's email account. I was able to retrieve it but you should see if there's anything wrong by contacting in...@apache.org
So your email was: ------------- From: "Severance, Steve" <ssevera...@ebay.com> To: "hbase-user@hadoop.apache.org" <hbase-user@hadoop.apache.org> Date: Wed, 17 Feb 2010 14:46:28 -0700 Subject: Region Server Count I am in the process of constructing a hadoop cluster with approximately 400 nodes. We are going to be running HBase for storing structured data and specifically making heavy use of row versioning. HBase data will primarily be consumed by map reduce jobs. Should I install a region server on every data node? Steve ------------- The answer is yes, you want to have a region server on every node or you will encounter issues where the nodes hosting region servers will be filled with data and the other nodes will be drastically less used. The reason is that HDFS always writes the first replica on the local datanode (if it exists). This gives better locality but in those special cases where writers aren't present on all slave nodes you get a very unbalanced cluster. J-D
