title: In HBase2.1.0, Get query is slow when HFile is too large (about 100GB)
body: <p>HBase2.1.0</p>
  <p>After Major Compaction, querying a record is too slow by Get query when single hfile is too large(about 100GB）.</p>
  <p>Target table has more than 30 regions，and total size is about 4TB.</p>
  <p>Reducing it to less than 50GB by spliting regions, I found  the speed of Get query returned to normal.</p>
  <p>This situation is puzzling. According the structure of hfile，the speed of Get query not affected by the size of hfile.</p>
  <p>who can help me? thanks a lot</p>