[SPARK-22837][SQL]Session timeout checker does not work in SessionManager.

Author: zuotingbing

sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/session/SessionManager.java

@@ -148,6 +148,15 @@ public synchronized void start() {
     }
   }
 
+  private void initSessionTimeoutCheckerConfig() {
+    checkInterval = HiveConf.getTimeVar(
+        hiveConf, ConfVars.HIVE_SERVER2_SESSION_CHECK_INTERVAL, TimeUnit.MILLISECONDS);
+    sessionTimeout = HiveConf.getTimeVar(
+        hiveConf, ConfVars.HIVE_SERVER2_IDLE_SESSION_TIMEOUT, TimeUnit.MILLISECONDS);
+    checkOperation = HiveConf.getBoolVar(hiveConf,
+        ConfVars.HIVE_SERVER2_IDLE_SESSION_CHECK_OPERATION);
+  }
+
   private void startTimeoutChecker() {
     final long interval = Math.max(checkInterval, 3000L);  // minimum 3 seconds
     Runnable timeoutChecker = new Runnable() {

sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLSessionManager.scala

@@ -42,6 +42,8 @@ private[hive] class SparkSQLSessionManager(hiveServer: HiveServer2, sqlContext:
   override def init(hiveConf: HiveConf) {
     setSuperField(this, "hiveConf", hiveConf)
 
+    invoke(classOf[SessionManager], this, "initSessionTimeoutCheckerConfig")
+
     // Create operation log root directory, if operation logging is enabled
     if (hiveConf.getBoolVar(ConfVars.HIVE_SERVER2_LOGGING_OPERATION_ENABLED)) {
       invoke(classOf[SessionManager], this, "initOperationLogRootDir")