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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