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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-775) FSDataset calls getCapacity() twice -bug?
Date Wed, 09 Dec 2009 14:05:23 GMT

     [ https://issues.apache.org/jira/browse/HDFS-775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HDFS-775:
--------------------------------

    Fix Version/s: 0.22.0
           Status: Patch Available  (was: Open)

No tests; this is a race condition being eliminated here. Proofs of correctness only are sufficient,
and I don't do those.

> 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
>            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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