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From "Abhishek Rai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10825) Snapshot read can reveal future bytes if snapshotted while writing
Date Thu, 01 Sep 2016 04:14:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Abhishek Rai updated HDFS-10825:
--------------------------------
    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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