Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/14534#discussion_r74020655 --- Diff: sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/server/SparkSQLOperationManager.scala --- @@ -39,15 +38,19 @@ private[thriftserver] class SparkSQLOperationManager() val handleToOperation = ReflectionUtils .getSuperField[JMap[OperationHandle, Operation]](this, "handleToOperation") - val sessionToActivePool = Map[SessionHandle, String]() - val sessionToContexts = Map[SessionHandle, SQLContext]() + val sessionToActivePool = new ConcurrentHashMap[SessionHandle, String]() + val sessionToContexts = new ConcurrentHashMap[SessionHandle, SQLContext]() override def newExecuteStatementOperation( parentSession: HiveSession, statement: String, confOverlay: JMap[String, String], async: Boolean): ExecuteStatementOperation = synchronized { - val sqlContext = sessionToContexts(parentSession.getSessionHandle) + val sqlContext = sessionToContexts.get(parentSession.getSessionHandle) + if (null == sqlContext) { --- End diff -- Does this have to be `HiveSQLException`? I'd just use `require` to generate an `IllegalArgumentException`
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