@Override
  protected int getNumQualifiersForTestWritesWhileScanning() {
    return 10;
  }
testWritesWhileScanning is flakey when called out of this class. Need to dig in. Meantime go
easy on it. See if that helps.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegionWithInMemoryFlush.java