Nemon Lou created HIVE-9095:
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Summary: permanent functions' ClassLoader should be global instead
of per-session
Key: HIVE-9095
URL: https://issues.apache.org/jira/browse/HIVE-9095
Project: Hive
Issue Type: Improvement
Components: HiveServer2, UDF
Affects Versions: 0.13.1, 0.14.0
Reporter: Nemon Lou
FunctionRegistry.mFunctions is static. That means that in HS2 case, all users
will share the same UDF class object from mFunctions ,which lead to share the
same classloader that load this class.
First,this will make the per-session classloader useless.Because only the first
classLoader will be used to initailize the instances of the permanent UDF class.
Second, it's will cause class not found exception,when the classLoader created
by the first session be closed before load all the classes that need.
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