@Override
    public StripeMultiFileWriter createWriter() throws IOException {
      return new StripeMultiFileWriter.SizeMultiWriter(comparator, this.targetCount, this.targetKvs,
        OPEN_KEY, OPEN_KEY);
    }
@param targetCount The maximum number of stripes to flush into.
@param targetKvs   The KV count of each segment. If targetKvs*targetCount is less than total
                   number of kvs, all the overflow data goes into the last stripe.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StripeStoreFlusher.java