[jira] Commented: (HADOOP-4210) Findbugs warnings are printed related to equals implementation of several classes

["Hudson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636026#action_12636026 ] 

Hudson commented on HADOOP-4210:
--------------------------------

Integrated in Hadoop-trunk #620 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/620/])
    . Fix findbugs warnings for equals implementations of mapred ID
classes. Removed public, static ID::read and ID::forName; made ID an
abstract class. Contributed by Suresh Srinivas.


> Findbugs warnings are printed related to equals implementation of several classes
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-4210
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4210
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 0.20.0
>
>         Attachments: HADOOP-4210.patch, HADOOP-4210.patch, HADOOP4210.patch
>
>
> During compilation - findbugs generates several warnings that indicates bugs in the implementation of equals method. One of the example of this report is:
> Bug type EQ_GETCLASS_AND_CLASS_CONSTANT (click for details)
> In class org.apache.hadoop.mapred.ID
> In method org.apache.hadoop.mapred.ID.equals(Object)
> At ID.java:[line 66]
> Value doesn't work for subtypes
> This class has an equals method that will be broken if it is inherited by subclasses. It compares a class literal with the class of the argument (e.g., in class Foo it might check if Foo.class == o.getClass()). It is better to check if this.getClass() == o.getClass().

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