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https://issues.apache.org/jira/browse/HDFS-10825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abhishek Rai updated HDFS-10825:
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Attachment: TestSnapshotFileBeingWritten.java
> 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
> Attachments: TestSnapshotFileBeingWritten.java
>
>
> 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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