public void applyBatch(long batchSize, long hfileSize) {
    applyBatch(batchSize);
    mss.incrAppliedHFiles(hfileSize);
  }
Convience method to change metrics when a batch of operations are applied.
@param batchSize total number of mutations that are applied/replicated
@param hfileSize total number of hfiles that are applied/replicated
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/MetricsSink.java