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https://issues.apache.org/jira/browse/HDFS-857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12799573#action_12799573
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Eli Collins commented on HDFS-857:
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test-c++-libhdfs doesn't cover fuse so actually it shouldn't fail,  TestFuseDFS 
would cover this though it's not currently running (HDFS-780).  I tried this 
patch locally and it worked. 

> Incorrect type for fuse-dfs capacity can cause "df" to return negative values 
> on 32-bit machines
> ------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-857
>                 URL: https://issues.apache.org/jira/browse/HDFS-857
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: contrib/fuse-dfs
>            Reporter: Brian Bockelman
>            Priority: Minor
>         Attachments: HDFS-857.patch
>
>
> On sufficiently large HDFS installs, the casting of hdfsGetCapacity to a long 
> may cause "df" to return negative values.  tOffset should be used instead.

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