[jira] [Created] (SPARK-17190) Removal of HiveSharedState

["Xiao Li (JIRA)" <ji...@apache.org>]

Xiao Li created SPARK-17190:
-------------------------------

             Summary: Removal of HiveSharedState
                 Key: SPARK-17190
                 URL: https://issues.apache.org/jira/browse/SPARK-17190
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Xiao Li


Since `HiveClient` is used to interact with the Hive metastore, it should be hidden in `HiveExternalCatalog`. After moving `HiveClient` into `HiveExternalCatalog`, `HiveSharedState` becomes a wrapper of `HiveExternalCatalog`. Thus, removal of `HiveSharedState` becomes straightforward. After removal of `HiveSharedState`, the reflection logic is directly applied on the choice of `ExternalCatalog` types, based on the configuration of `CATALOG_IMPLEMENTATION`. 

`HiveClient` is also used/invoked by the other entities besides HiveExternalCatalog, we defines the following two APIs:
{noformat}
  /**
   * Return the existing [[HiveClient]] used to interact with the metastore.
   */
  def getClient: HiveClient

  /**
   * Return a [[HiveClient]] as a new session
   */
  def getNewClient: HiveClient
{noformat}



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