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From "Hairong Kuang" <hair...@yahoo-inc.com>
Subject RE: HDFS replica management
Date Tue, 17 Jul 2007 19:30:05 GMT
>> Which package in the
>> source code could I look at to glean this information ?

>This is in dfs/FSNameSystem.java.

FSNameSystem.java is a huge chunk of source code. To be more specific,
datanode failure detection is done by HeartbeatMonitor. Once a data node is
detected as dead, all blocks belonged to this data node will be put in
neededReplications queue. Then the ReplicationMonitor will start to
replicate those under-replicated blocks. All the replication target chosen
logic is in dfs/ReplicationTargetChooser.java.

Hairong


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