Jinghui Wang created HADOOP-11221:
-------------------------------------
Summary: 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:title=Bar.java|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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