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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2560) Refactor BPOfferService to be a static inner class
Date Thu, 17 Nov 2011 07:48:51 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-2560:

    Target Version/s: HA branch (HDFS-1623), 0.23.1  (was: 0.23.1, HA branch (HDFS-1623))
              Status: Patch Available  (was: Open)
> Refactor BPOfferService to be a static inner class
> --------------------------------------------------
>                 Key: HDFS-2560
>                 URL: https://issues.apache.org/jira/browse/HDFS-2560
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-2560.txt
> Currently BPOfferService is a non-static inner class of DataNode. For HA we are adding
another inner class inside of this, which makes the scope very hard to understand when reading
the code (and has resulted in subtle bugs like HDFS-2529 where a variable is referenced from
the wrong scope. Making it a static inner class with a reference to the DN has two advantages:
a) scope is now explicit, and b) enables unit testing of the BPOS against a mocked-out DN.

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