FAQ
The namenode could remember the last good location of a missing block
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Key: HDFS-1200
URL: https://issues.apache.org/jira/browse/HDFS-1200
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: dhruba borthakur


There are times when datanodes die and all replicas of a block are lost. An fsck on the HDFS reports these as "MISSING" blocks in the filesystem. The administrator has to go mine through lots of namenode logs to find out which datanode(s) had a replica of that block. Then the administrator can try to reboot that particular datanode to retrieve the missing block.

This case can me made easier if the NN remembered the last known good replica location of a block. An fsck command can report it and the it will help the administrator to determine if that particular dead datanode can be brought back to life.

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postedJun 11, '10 at 5:34a
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