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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4797) BlockScanInfo does not override equals(..) and hashCode() consistently
Date Sat, 29 Jun 2013 13:43:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696129#comment-13696129
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4797:
----------------------------------------------

Thanks Uma.  I just have started a build.
                
> BlockScanInfo does not override equals(..) and hashCode() consistently
> ----------------------------------------------------------------------
>
>                 Key: HDFS-4797
>                 URL: https://issues.apache.org/jira/browse/HDFS-4797
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Minor
>         Attachments: h4797_20130513b.patch, h4797_20130513.patch
>
>
> In the code below, equals(..) compares lastScanTime but hashCode() is computed using
block ID.  Therefore, it could have two BlockScanInfo objects which are equal but have two
different hash codes.
> {code}
> //BlockScanInfo
>     @Override
>     public int hashCode() {
>       return block.hashCode();
>     }
>     
>     @Override
>     public boolean equals(Object other) {
>       return other instanceof BlockScanInfo &&
>              compareTo((BlockScanInfo)other) == 0;
>     }
> {code}

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