@Override
  public String toString() {
    return "FlushLargeStoresPolicy{" + "flushSizeLowerBound=" + flushSizeLowerBound + '}';
  }
A {@link FlushPolicy} that only flushes store larger a given threshold. If no store is large
enough, then all stores will be flushed.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/FlushLargeStoresPolicy.java