public static void close(String handleId) throws IOException {
    List<Connection> handleConnections;
    synchronized (lock) {
      handleConnections = connectionMap.remove(handleId);
    }
    closeConnections(handleId, handleConnections);
  }
Close the connection associated with the handle ID, if getSplits() was configured with a handle ID.
Call when the application is done using the splits generated by getSplits().
@param handleId Handle ID used in configuration for getSplits()
@throws IOException
llap-ext-client/src/java/org/apache/hadoop/hive/llap/LlapBaseInputFormat.java