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Posted to hdfs-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2014/07/02 21:56:25 UTC

[jira] [Created] (HDFS-6622) Rename and AddBlock may race and produce invalid edits

Kihwal Lee created HDFS-6622:
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             Summary: Rename and AddBlock may race and produce invalid edits
                 Key: HDFS-6622
                 URL: https://issues.apache.org/jira/browse/HDFS-6622
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.5.0
            Reporter: Kihwal Lee
            Priority: Blocker


While investigating HDFS-6681, we have discovered that rename happening in the middle of {{getAdditionalBlock()}} can lead to logging of invalid edit entry.

In  {{getAdditionalBlock()}} , the path is resolved once while holding the read lock and the same resolved path will be used in the edit log in the second half of the method holding the write lock.  If a rename happens in between two locks, the path may no longer exist. 

When replaying the {{AddBlockOp}}, it will fail with FileNotFound.



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