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https://issues.apache.org/jira/browse/HIVE-9095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nemon Lou updated HIVE-9095:
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Description:
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 has been closed before load all the classes that need.
was:
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.
> 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: 0.14.0, 0.13.1
> 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 has been closed before load all the classes that
> need.
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