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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6651) Deletion failure can leak inodes permanently.
Date Wed, 09 Jul 2014 17:41:04 GMT
Kihwal Lee created HDFS-6651:

             Summary: Deletion failure can leak inodes permanently.
                 Key: HDFS-6651
                 URL: https://issues.apache.org/jira/browse/HDFS-6651
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Kihwal Lee
            Priority: Critical

As discussed in HDFS-6618, if a deletion of tree fails in the middle, any collected inodes
and blocks will not be removed from {{INodeMap}} and {{BlocksMap}}. 

Since fsimage is saved by iterating over {{INodeMap}}, the leak will persist across name node
restart. Although blanked out inodes will not have reference to blocks, blocks will still
refer to the inode as {{BlockCollection}}. As long as it is not null, blocks will live on.
The leaked blocks from blanked out inodes will go away after restart.

Options (when delete fails in the middle)
- Complete the partial delete: edit log the partial delete and remove inodes and blocks. 
- Somehow undo the partial delete.
- Check quota for snapshot diff beforehand for the whole subtree.
- Ignore quota check during delete even if snapshot is present.

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