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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7045) TestDU fails on systems with local file systems with extended attributes
Date Fri, 19 Nov 2010 04:10:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933667#action_12933667

Hadoop QA commented on HADOOP-7045:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 1036694.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 5 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/113//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/113//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/113//console

This message is automatically generated.

> TestDU fails on systems with local file systems with extended attributes
> ------------------------------------------------------------------------
>                 Key: HADOOP-7045
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7045
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>            Priority: Minor
>             Fix For: 0.23.0
>         Attachments: hadoop-7045-1.patch
> The test reports that the file takes an extra 4k on disk:
> {noformat}
> Testcase: testDU took 5.74 sec
>         FAILED
> expected:<32768> but was:<36864>
> junit.framework.AssertionFailedError: expected:<32768> but was:<36864>
>         at org.apache.hadoop.fs.TestDU.testDU(TestDU.java:79)
> {noformat}
> This is because du reports 32k for the file and 4k because the file system it lives on
uses extended attributes.
> {noformat}
> common-branch-0.20 $ dd if=/dev/zero of=data bs=4096 count=8
> 8+0 records in
> 8+0 records out
> 32768 bytes (33 kB) copied, 9.6e-05 seconds, 341 MB/s
> common-branch-0.20 $ du data
> 36	data
> common-branch-0.20 $ du --apparent-size data
> 32	data
> {noformat}
> We should modify the test to allow for some extra on-disk slack. The on-disk usage could
also be smaller if the file data is all zeros or compression is enabled. The test currently
handles the former by writing random data, we're punting on the latter.

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