The datanode used the dfs config xml file to tell the datanode process, what disks are available for storage. Can you check that the config xml has all the partitions mentioned and has not been overwritten during the restore process? -Ayon See My Photos on Flickr Also check out my Blog for answers to commonly asked questions.
________________________________ From: felix gao <gre1...@gmail.com> To: hdfs-user@hadoop.apache.org Sent: Tue, April 12, 2011 7:46:31 AM Subject: Question regarding datanode been wiped by hadoop What reason/condition would cause a datanode’s blocks to be removed? Our cluster had a one of its datanodes crash because of bad RAM. After the system was upgraded and the datanode/tasktracker brought online the next day we noticed the amount of space utilized was minimal and the cluster was rebalancing blocks to the datanode. It would seem the prior blocks were removed. Was this because the datanode was declared dead? What is the criteria for a namenode to decide (Assuming its the namenode) when a datanode should remove prior blocks?
