@Test
  public void testScannerCloseAndUpdateReaders1() throws Exception {
    testScannerCloseAndUpdateReaderInternal(true, false);
  }
This test tests whether parallel {@link StoreScanner#close()} and
{@link StoreScanner#updateReaders(List, List)} works perfectly ensuring that there are no
references on the existing Storescanner readers.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreScannerClosure.java