title: HBase Scan Performance
body: <p>I am performing a range scan that is giving me 500k records.
  If I set <code>scan.setCaching(100000)</code> it took less than one second, but if <code>scan.setCaching(100000)</code> is not set it took nearly 38 sec.</p>
  
  <p>If I set <code>scan.setBlockCache(false)</code> and <code>scan.setCaching(100000)</code> what will happen? Will the rows be cached or not?</p>
  
  <p>I am dropping OS cache after first scan but there is no change in the time for scanning the records. Why?</p>
  
  <p>Then how can I check the read performance? </p>