title: What will happen if a hive(0.13) SELECT and INSERT OVERWRITE are running at the same time
body: <p>I would like to know what will happen if a hive SELECT and INSERT OVERWRITE is running at the same time. Please help me to understand what will hive query return in the below scenarios.</p>
  
  <p>Run the query first, while the query is running, INSERT OVERWRITE the same table.</p>
  
  <p>Run the INSERT OVERWRITE first, while overwriting, pull the data from the same table with SELECT.</p>
  
  <p>Are we going to get the old data, new data, mixed data, nothing, or unpredictable data?</p>
  
  <p>I am using MapR 4.0.1, Hive 0.13.</p>
  
  <p>Best regards,</p>
  
  <p>Ryan</p>