Abhishek Rai created HDFS-10825:
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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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