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https://issues.apache.org/jira/browse/HADOOP-11221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185516#comment-14185516
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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/12677335/HADOOP-11221.v3.patch
against trunk revision 463aec1.
{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/4960//testReport/
Console output:
https://builds.apache.org/job/PreCommit-HADOOP-Build/4960//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,
> HADOOP-11221.v2.patch, HADOOP-11221.v3.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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