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Posted to common-issues@hadoop.apache.org by "Jinghui Wang (JIRA)" <ji...@apache.org> on 2014/10/23 20:21:34 UTC
[jira] [Commented] (HADOOP-11221) JAVA specification for hashcode
does not enforce it to be non-negative, but IdentityHashStore assumes
System.identityHashCode() is non-negative
[ https://issues.apache.org/jira/browse/HADOOP-11221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14181706#comment-14181706 ]
Jinghui Wang commented on HADOOP-11221:
---------------------------------------
This causes failures with IBM JAVA where System.identityHashCode can return negative values. Attached patch fixes the problem.
> 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
>
> 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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