@Override
  protected void configureForRegion(HRegion region) {
    super.configureForRegion(region);
    setFlushSizeLowerBounds(region);
    for (HStore store : region.stores.values()) {
      if (store.isSloppyMemStore()) {
        sloppyStores.add(store);
      } else {
        regularStores.add(store);
      }
    }
  }
Returns the stores need to be flushed.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/FlushNonSloppyStoresFirstPolicy.java