PerformanceEvaluation "--nomapred" may assign duplicate random seed over
multiple testing threads
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Key: HBASE-2269
URL: https://issues.apache.org/jira/browse/HBASE-2269
Project: Hadoop HBase
Issue Type: Bug
Components: test
Affects Versions: 0.20.3
Environment: Any operating system
Reporter: Tatsuya Kawano
Priority: Minor
When you use PerformanceEvaluation with "--nomapred" option, you will end up
having the same random seeds assigned over multiple testing threads. So you'll
get inaccurate results from "random~~" tests.
{code:title=PerformanceEvaluation.java}
542: abstract class Test {
543: protected final Random rand = new Random(System.currentTimeMillis());
{code}
Milliseconds won't be sufficient; today's JVM is much faster to create multiple
Test objects in one millisecond. You might want to use something like
"{{super.hashCode()}}" instead.
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