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https://issues.apache.org/jira/browse/HDFS-7738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306558#comment-14306558
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Yi Liu commented on HDFS-7738:
------------------------------

I notice the patch distinguishes recover lease exception string for 
create/truncate/append/recover file, it's great, I also had the same thought, 
but the exception is still {{AlreadyBeingCreatedException}}, should we redefine 
it?
Besides this, I'm +1 for the patch and pending Jenkins.

> 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
>
>
> 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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