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https://issues.apache.org/jira/browse/HDFS-7738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309727#comment-14309727
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Konstantin Shvachko commented on HDFS-7738:
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> it is better to have some random test.
In general I don't like random tests because they imply intermittent failures,
which are hard to reproduce and therefore fix.
If the desire to have these is strong then they need sufficient logging
information, which would describe the full conditions under which a failure
occurs when it does.
In this particular case your test is a subset of the existing test on its every
run.
Will look at the patch in a bit.
> Add more negative tests for truncate
> ------------------------------------
>
> Key: HDFS-7738
> URL: https://issues.apache.org/jira/browse/HDFS-7738
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: test
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Priority: Minor
> Fix For: 2.7.0
>
> Attachments: h7738_20150204.patch, h7738_20150205.patch,
> h7738_20150205b.patch, h7738_20150206.patch
>
>
> The following are negative test cases for truncate.
> - new length > old length
> - truncating a directory
> - truncating a non-existing file
> - truncating a file without write permission
> - truncating a file opened for append
> - truncating a file in safemode
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