Hi, You could try to decommission the node. More information is provided here http://wiki.apache.org/hadoop/FAQ#17 When you request the NN to decommission a node, it tries to replicate all the blocks on that node to different node.
PS : 1 replica is always at risk of losing data, try atleast two, may be having the files compressed might help. Lohit ----- Original Message ---- From: "Zhou, Yunqing" <[EMAIL PROTECTED]> To: [email protected] Sent: Thursday, November 13, 2008 1:06:00 AM Subject: How to exclude machines from a cluster Here is a cluster with 13 machines. And due to the lack of storage space, we set the replication factor to 1. but recently we found 2 machines in the cluster are not stable. so I'd like to exclude them from the cluster. but I can't simply set the replication factor to 1 and remove them due to the large amount of data. so is there a way I can force hadoop to move the block stored on them to other machines? Thanks.
