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https://issues.apache.org/jira/browse/HDFS-775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794615#action_12794615
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Hudson commented on HDFS-775:
-----------------------------
Integrated in Hadoop-Hdfs-trunk #182 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk/182/])
> FSDataset calls getCapacity() twice -bug?
> -----------------------------------------
>
> Key: HDFS-775
> URL: https://issues.apache.org/jira/browse/HDFS-775
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 0.22.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 0.22.0
>
> Attachments: HDFS-775-1.patch, HDFS-775-2.patch
>
>
> I'm not sure this is a bug or "as intended", but I thought I'd mention it.
> FSDataset.getCapacity() calls DF.getCapacity() twice, when evaluating its
> capacity. Although there is caching to stop the shell being exec'd twice in a
> row, there is a risk that the first call doesn't run the shell, and the
> second does -so the value changes during the method.
> If that is not intended, it is better to cache the first value for the whole
> method
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