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From "Brandon Li (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3075) Add mechanism to restore the removed storage directories
Date Sun, 11 Mar 2012 22:18:40 GMT
Add mechanism to restore the removed storage directories

                 Key: HDFS-3075
                 URL: https://issues.apache.org/jira/browse/HDFS-3075
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.24.0, 1.1.0
            Reporter: Brandon Li
            Assignee: Brandon Li

When a storage directory is inaccessible, namenode removes it from the valid storage dir list
to a removedStorageDirs list. Those storage directories will not be restored when they become
healthy again. 

The proposed solution is to restore the previous failed directories at the beginning of checkpointing,
say, rollEdits, by copying necessary metadata files from healthy directory to unhealthy ones.
In this way, whenever a failed storage directory is recovered by the administrator, he/she
can immediately force a checkpointing to restored a failed directory.

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