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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6423) Diskspace quota usage should be updated when appending data to partial block
Date Fri, 23 May 2014 04:56:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14006804#comment-14006804
] 

Hudson commented on HDFS-6423:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #563 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/563/])
HDFS-6423. Diskspace quota usage should be updated when appending data to partial block. Contributed
by Jing Zhao. (jing9: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1596774)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java


> Diskspace quota usage should be updated when appending data to partial block
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-6423
>                 URL: https://issues.apache.org/jira/browse/HDFS-6423
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>             Fix For: 2.5.0
>
>         Attachments: HDFS-6423.000.patch, HDFS-6423.001.patch, HDFS-6423.002.patch
>
>
> When appending new data to a file whose last block is a partial block, the diskspace
quota usage is not correctly update. For example, suppose the block size is 1024 bytes, and
a file has size 1536 bytes (1.5 blocks). If we then append another 1024 bytes to the file,
the diskspace usage for this file will not be updated to (2560 * replication) as expected,
but (2048 * replication).
> The cause of the issue is that in FSNamesystem#commitOrCompleteLastBlock, we have 
> {code}
>     // Adjust disk space consumption if required
>     final long diff = fileINode.getPreferredBlockSize() - commitBlock.getNumBytes();
   
>     if (diff > 0) {
>       try {
>         String path = fileINode.getFullPathName();
>         dir.updateSpaceConsumed(path, 0, -diff*fileINode.getFileReplication());
>       } catch (IOException e) {
>         LOG.warn("Unexpected exception while updating disk space.", e);
>       }
>     }
> {code}
> This code assumes that the last block of the file has never been completed before, thus
is always counted with the preferred block size in quota computation.



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