[HIVE-22737] Concurrency: FunctionRegistry::getFunctionInfo is static object locked

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Component/s: Logical Optimizer, UDF
• Assignee: Ashutosh Chauhan
• Reporter: Gopal Vijayaraghavan
• Created: 16/Jan/20 13:58
• Updated: 03/May/20 07:48
• Resolved: 03/May/20 07:48

Description

The lock is inside a HS2-wide static object

https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java#L191

  // registry for system functions
  private static final Registry system = new Registry(true);

And this is the lock itself

https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/Registry.java#L332

  public FunctionInfo getFunctionInfo(String functionName) throws SemanticException {
    lock.lock();