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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