Gopal V created HIVE-22161: ------------------------------ 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. -- This message was sent by Atlassian Jira (v8.3.2#803003)