static void resetController(HBaseRpcController controller, long timeoutNs, int priority,
    TableName tableName) {
    controller.reset();
    if (timeoutNs >= 0) {
      controller.setCallTimeout(
        (int) Math.min(Integer.MAX_VALUE, TimeUnit.NANOSECONDS.toMillis(timeoutNs)));
    }
    controller.setPriority(priority);
    if (tableName != null) {
      controller.setTableName(tableName);
    }
  }
Create a row before the specified row and very close to the specified row.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionUtils.java