Gopal V created HIVE-22161:
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Summary: UDF: FunctionRegistry should cache statefulness of UDF
Key: HIVE-22161
URL: https://issues.apache.org/jira/browse/HIVE-22161
Project: Hive
Issue Type: Bug
Components: UDF
Reporter: Gopal V
There's a hidden synchronization across threads when looking up isStateful and
isDeterministic.
https://github.com/apache/hive/blob/master/common/src/java/org/apache/hive/common/util/AnnotationUtils.java#L27
{code}
// to avoid https://bugs.openjdk.java.net/browse/JDK-7122142
public static <T extends Annotation> T getAnnotation(Class<?> clazz, Class<T>
annotationClass) {
synchronized (annotationClass) {
return clazz.getAnnotation(annotationClass);
}
}
{code}
This is serializing multiple threads initializing UDFs (or checking them during
compilation) & also being locked across threads for each instance of
GenericUDFOpEqual in the specific scenario.
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