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From felix gao <gre1...@gmail.com>
Subject Question regarding datanode been wiped by hadoop
Date Tue, 12 Apr 2011 14:46:31 GMT
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?

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