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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1094) Intelligent block placement policy to decrease probability of block loss
Date Mon, 12 Apr 2010 07:07:42 GMT
Intelligent block placement policy to decrease probability of block loss
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                 Key: HDFS-1094
                 URL: https://issues.apache.org/jira/browse/HDFS-1094
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur


The current HDFS implementation specifies that the first replica is local and the other two
replicas are on any two random nodes on a random remote rack. This means that if any three
datanodes die together, then there is a non-trivial probability of losing at least one block
in the cluster. This JIRA is to discuss if there is a better algorithm that can lower probability
of losing a block.

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