The namenode could remember the last good location of a missing block ---------------------------------------------------------------------
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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.