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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2560) Refactor BPOfferService to be a static inner class
Date Thu, 17 Nov 2011 06:09:51 GMT
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


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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