public void update(byte[] region, RegionLoadStats currentStats) {
    RegionStatistics regionStat = this.stats.get(region);
    if (regionStat == null) {
      regionStat = new RegionStatistics();
      this.stats.put(region, regionStat);
    }

    regionStat.update(currentStats);
  }
Good enough attempt. Last writer wins. It doesn't really matter which one gets to update, as
something gets set
hbase-client/src/main/java/org/apache/hadoop/hbase/client/backoff/ServerStatistics.java