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