Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9170#issuecomment-149433030
hmm. When we close a session in thrift server, we will close the session
state, which internally closes the class loader (the code starts from
https://github.com/apache/spark/blob/master/sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLSessionManager.scala#L77
and `SessionState.close` will call
`JavaUtils.closeClassLoadersTo(conf.getClassLoader(), parentLoader)`). So, the
mutable classloader will be closed after we close a jdbc session. Actually,
this behavior may cause problems even if we do not use this mutable classloader.
@liancheng For our thrift server, do we need to use `HiveSession`?
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