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https://issues.apache.org/jira/browse/HADOOP-7045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins updated HADOOP-7045:
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Resolution: Fixed
Hadoop Flags: [Reviewed]
Status: Resolved (was: Patch Available)
Thanks Cos! I've committed this.
> 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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