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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-692) Rack-aware Replica Placement
Date Wed, 08 Nov 2006 18:50:53 GMT
Rack-aware Replica Placement
----------------------------

                 Key: HADOOP-692
                 URL: http://issues.apache.org/jira/browse/HADOOP-692
             Project: Hadoop
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.8.0
            Reporter: Hairong Kuang
         Assigned To: Hairong Kuang
             Fix For: 0.9.0


This issue assumes that HDFS runs on a cluster of computers that spread across many racks.
Communication between two nodes on different racks needs to go through switches. Bandwidth
in/out of a rack may be less than the total bandwidth of machines in the rack. The purpose
of rack-aware replica placement is to improve data reliability, availability, and network
bandwidth utilization. The basic idea is that each data node determines to which rack it belongs
at the startup time and notifies the name node of the rack id upon registration. The name
node maintains a rackid-to-datanode map and tries to place replicas across racks.


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