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From "Abhishek Rai (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10825) Snapshot read can reveal future bytes if snapshotted while writing
Date Thu, 01 Sep 2016 04:13:20 GMT
Abhishek Rai created HDFS-10825:
-----------------------------------

             Summary: Snapshot read can reveal future bytes if snapshotted while writing
                 Key: HDFS-10825
                 URL: https://issues.apache.org/jira/browse/HDFS-10825
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
    Affects Versions: 2.7.2
         Environment: HDFS-2.7.2, see attached unittest file.
            Reporter: Abhishek Rai


The following sequence of steps will produce extra bytes, that should not be visible, because
they are not in the snapshot.

- Create a new file for writing.
- Write "hello world"
- Invoke hsync() on the file handle.
- Create a snapshot, keep the file open.
- Append another "hello world" string to the same file handle.
- Close the file.
- Read file in the snapshot (not the current file).
- Output is "hello worldhello world" instead of the expected snapshot contents of "hello world".



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