static MemStoreLAB newInstance(Configuration conf) {
    MemStoreLAB memStoreLAB = null;
    if (isEnabled(conf)) {
      String className = conf.get(MSLAB_CLASS_NAME, MemStoreLABImpl.class.getName());
      memStoreLAB = ReflectionUtils.instantiateWithCustomCtor(className,
        new Class[] { Configuration.class }, new Object[] { conf });
    }
    return memStoreLAB;
  }
Called when closing a scanner on the data of this MemStoreLAB
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreLAB.java