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## What changes were proposed in this pull request? As per https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html ``Class loaders that support concurrent loading of classes are known as parallel capable class loaders and are required to register themselves at their class initialization time by invoking the ClassLoader.registerAsParallelCapable method. Note that the ClassLoader class is registered as parallel capable by default. However, its subclasses still need to register themselves if they are parallel capable. `` i.e we can have finer class loading locks by registering classloaders as parallel capable. (Refer to deadlock due to macro lock https://issues.apache.org/jira/browse/SPARK-26961). All the classloaders we have are wrapper of URLClassLoader which by itself is parallel capable. But this cannot be achieved by scala code due to static registration Refer https://github.com/scala/bug/issues/11429 ## How was this patch tested? All Existing UT must pass Closes #24126 from ajithme/driverlock. Authored-by: Ajith <ajith2489@gmail.com> Signed-off-by: Sean Owen <sean.owen@databricks.com> |
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