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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7949) WebImageViewer need support file size calculation with striped blocks
Date Wed, 08 Apr 2015 17:21:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485578#comment-14485578
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Zhe Zhang commented on HDFS-7949:
---------------------------------

Thanks for the update Rakesh. 
# I think the static method should calculate the consumed space of a striped block, instead
of a file. Something like the below under {{BlockInfoStriped}}:
{code}
  public static long spaceConsumed(long numBytes, short dataBlockNum, short  parityBlockNum)
{
    // In case striped blocks, total usage by this striped blocks should
    // be the total of data blocks and parity blocks because
    // `getNumBytes` is the total of actual data block size.
    return ((getNumBytes() - 1) / (dataBlockNum * BLOCK_STRIPED_CELL_SIZE) + 1)
        * BLOCK_STRIPED_CELL_SIZE * parityBlockNum + getNumBytes();
  }
{code}
The file level logic should still be in {{FSImageLoader}}.
# Javadoc format issue:
{code}
+   * @param f
+   *          inode file
+   * @return file size
{code}

> WebImageViewer need support file size calculation with striped blocks
> ---------------------------------------------------------------------
>
>                 Key: HDFS-7949
>                 URL: https://issues.apache.org/jira/browse/HDFS-7949
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Hui Zheng
>            Assignee: Rakesh R
>            Priority: Minor
>         Attachments: HDFS-7949-001.patch, HDFS-7949-002.patch
>
>
> The file size calculation should be changed when the blocks of the file are striped in
WebImageViewer.



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