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decommissioning datanodes

I'm in the trying to figure out how to decommission data nodes. Here's what
I do:

In hdfs-site.xml I have:


Add to exclude file:


Then I run 'hadoop dfsadmin -refreshNodes'. On the web interface the two
nodes now appear in both the 'Live Nodes' and 'Dead Nodes' (but there's
nothing in the Decommissioning Nodes list). If I look at the datanode logs
running on host1 or host2, I still see blocks being copied in and it does
not appear that any additional replication was happening.

What am I missing during the decommission process?