[jira] [Work started] (HDFS-7263) Snapshot read of an appended file returns more bytes than the file length.

["Tao Luo (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-7263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-7263 started by Tao Luo.
-------------------------------------
> Snapshot read of an appended file returns more bytes than the file length.
> --------------------------------------------------------------------------
>
>                 Key: HDFS-7263
>                 URL: https://issues.apache.org/jira/browse/HDFS-7263
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.5.0
>            Reporter: Konstantin Shvachko
>            Assignee: Tao Luo
>         Attachments: HDFS-7263.patch, TestSnapshotRead.java
>
>
> The following sequence of steps will produce extra bytes, that should not be visible, because they are not in the snapshot.
> * Create a file of size L, where {{L % blockSize != 0}}.
> * Create a snapshot
> * Append bytes to the file
> * Read file in the snapshot (not the current file)
> * You will see the bytes are read beoynd the original file size L



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