private long getStripeFilesSize(int stripeIndex) {
    long result = 0;
    for (HStoreFile sf : state.stripeFiles.get(stripeIndex)) {
      result += sf.getReader().length();
    }
    return result;
  }
Gets the total size of all files in the stripe.
@param stripeIndex Stripe index.
@return Size.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StripeStoreFileManager.java