Rack-aware Replica Placement
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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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