Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14534#discussion_r74024410
  
    --- 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]()
    --- End diff --
    
    It's only `private[thriftserver]`. It's minor, and a whole lot of stuff in 
Spark that should be `private` isn't, but I wondered if it was worth it here 
because you're concerned with synchronizing access to this object and therefore 
possibly concerned with what is accessing it. The usages you changed look like 
they're sufficiently protected, but are there others BTW? 


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