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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1200) The namenode could remember the last good location of a missing block
Date Fri, 11 Jun 2010 05:34:13 GMT
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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