[jira] [Work started] (HDFS-10825) Snapshot read can reveal future bytes if snapshotted while writing

["Manoj Govindassamy (JIRA)" <ji...@apache.org>]

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

Work on HDFS-10825 started by Manoj Govindassamy.
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> 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
>            Assignee: Manoj Govindassamy
>         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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