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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11221) JAVA specification for hashcode does not enforce it to be non-negative, but IdentityHashStore assumes System.identityHashCode() is non-negative
Date Fri, 24 Oct 2014 02:02:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14182305#comment-14182305
] 

Hadoop QA commented on HADOOP-11221:
------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12676803/HADOOP-11221.v1.patch
  against trunk revision db45f04.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/4943//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/4943//console

This message is automatically generated.

> JAVA specification for hashcode does not enforce it to be non-negative, but IdentityHashStore
assumes System.identityHashCode() is non-negative
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-11221
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11221
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 2.4.1
>            Reporter: Jinghui Wang
>            Assignee: Jinghui Wang
>         Attachments: HADOOP-11221.patch, HADOOP-11221.v1.patch
>
>
> The following code snippet shows that IdentityHashStore assumes the hashCode is always
non-negative.
> {code:borderStyle=solid}
>    private void putInternal(Object k, Object v) {
>      int hash = System.identityHashCode(k);
>      final int numEntries = buffer.length / 2;
>      int index = hash % numEntries;
> 	 ...
>    }
>    
>   private int getElementIndex(K k) {
>      ...
>      final int numEntries = buffer.length / 2;
>      int hash = System.identityHashCode(k);
>      int index = hash % numEntries;
>      int firstIndex = index;
>      ...
>   }
> {code}



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